E6581315⑫

TOSVERT VF-AS1 Series

RS485 Communication Function
Instruction Manual

NOTICE
1. Read this manual before installing or operating. Keep this instruction manual on hand of the
end user, and make use of this manual in maintenance and inspection.
2. All information contained in this manual will be changed without notice. Please contact your
Toshiba distributor to confirm the latest information.
 E6581315

Read first
Safety precautions
This manual and labels on the inverter provide very important information that you should bear in
mind to use the inverter properly and safely, and also to avoid injury to yourself and other people
and damage to property.
Read the safety precautions in the instruction manual for your inverter before reading this manual
and strictly follow the safety instructions given.

Notice Reference

 Insert an electromagnetic contactor between the inverter and the power supply so that Inverter instruction
the machine can be stopped without fail from an external controller in case of an manual
emergency.

 Do not write the same parameter to the EEPROM more than 10,000 times. The life Section 4.2
time of EEPROM is approximately 10,000 times.(Some parameters are not limited, “Commands”
please refer to the “9.Parameter data “)
When using the TOSHIBA inverter protocol and the data does not need to be records,
use P command (the data is written only to RAM).

 About the handling of the inverter, please follow the instruction manual of the inverter.

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Contents
1. General outlines of the communication function ........................................................................................................ 3
2. Data transmission specifications ................................................................................................................................ 4
3. Communication protocol ............................................................................................................................................. 5
3.1. About the handling of received frames ............................................................................................................. 5
4. TOSHIBA Inverter Protocol......................................................................................................................................... 6
4.1. Data transmission format ................................................................................................................................. 7
4.1.1. Data transmission format used in ASCII mode ..................................................................................... 7
4.1.2. Data transmission format used in binary mode .................................................................................. 10
4.1.3. Transmission format of Block Communication ................................................................................... 13
4.2. Commands ..................................................................................................................................................... 17
4.3. Transmission errors ....................................................................................................................................... 20
4.4. Broadcast communication function ................................................................................................................ 21
4.5. Examples of the use of communication commands ....................................................................................... 23
4.6. Examples of Communication programs ......................................................................................................... 24
5. MODBUS-RTU protocol ............................................................................................................................................ 29
5.1. MODBUS-RTU transmission format ............................................................................................................ 30
5.1.1. Read command (03) ........................................................................................................................... 30
5.1.2. Write command (06) ........................................................................................................................... 31
5.2. CRC Generation ............................................................................................................................................. 32
5.3. Error codes..................................................................................................................................................... 32
6. Inter-drive communication ........................................................................................................................................ 33
6.1. Proportional control of speed ......................................................................................................................... 37
6.2. Transmission format for inter-drive communication ....................................................................................... 39
7. Communication parameters ..................................................................................................................................... 40
7.1. Baud rate(, ) , Parity (, f827) ............................................................................... 42
7.2. Inverter number() ............................................................................................................................... 42
7.3. Communication time-out detection (f803) (f804) (f808) ................................................................. 43
7.4. Send waiting time (, ) ............................................................................................................ 45
7.5. Free notes() ....................................................................................................................................... 45
8. Commands and monitoring from the computer ........................................................................................................ 46
8.1. Communication commands (commands from the computer) ........................................................................ 46
8.2. Monitoring from the computer ........................................................................................................................ 51
8.3. Utilizing panel (LEDs and keys) by communication ....................................................................................... 60
8.3.1. LED setting by communication ........................................................................................................... 60
8.3.2. Key utilization by communication ........................................................................................................ 63
9. Parameter data ......................................................................................................................................................... 64
Appendix 1 Table of data codes........................................................................................................................................ 69
Appendix 2 Response time ............................................................................................................................................... 70
Appendix 3 Compatibility with the communication ............................................................................................................ 71
function of the VF-A7 ........................................................................................................................................................ 71
Appendix 4 Troubleshooting ............................................................................................................................................. 72
Appendix 5 Connecting for RS485 communication........................................................................................................... 73
Appendix 6 Inverter capacity code (FB05) ........................................................................................................................ 75

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1. General outlines of the communication function

This manual explains the RS485 communication function provided for the TOSVERT VF-AS1 se-
ries of industrial inverters.

(1) RS485 communication by the use of a two-wire RS485 communication port (standard function)
(2) RS485 communication by the use of a four-wire RS485 communication port (standard function)

(1) 2-wire RS485 communication

connector

(2) 4wire RS485 communication

connector

By using these communication functions in combination with the computer link function designed to
establish a link between a higher level computing machine or controller (hereinafter referred to as
a computer) and each inverter on the network, or with the inter-drive communication function that
allows proportional control of inverters without using a computer, you can set up a network for data
communication between inverters.
There are two communication protocols available: Toshiba Inverter Protocol and MODBUS-RTU
Protocol (this command does not support all commands). To select a protocol, the communication
protocol selection parameter f807 or f829 is used. (Refer to Section 3. Communication pro-
tocol.)

<Computer link>
By preparing the program (explained later), the following information can be exchanged between
the computer (host) and the inverter.
(1) Monitoring function (used to monitor the operating status of the inverter: Output frequency,
current, voltage, etc.)
(2) Command function (used to issue run, stop and other commands to the inverter)
(3) Parameter function (used to set parameters and read their settings)

<Inter-drive communication function>

Master inverter sends the data, that is selected by the parameter, to all the slave inverters on the
same network. This function allows a network construction in which a simple synchronous or pro-
portional operation is possible among plural inverters (without the host computer).
As for data communication codes, the TOSVERT VF-AS1 series of inverters support the binary
(HEX) code, in addition to the JIS (ASCII) code. A communication number is used to access the
desired data item.

* The smallest unit of information that computers handle is called a “bit (binary digit),” which rep-
resents the two numbers in the binary system: 1 or 0. A group of 16 bits is referred to as a
“word,” which is the basic unit of information the VF-AS1 series of inverters use for data commu-
nication. One word can handle data items of 0 to FFFFH in hexadecimal notation (or 0 to 65535
in decimal notation).

BIT15 BIT8 BIT7 BIT0

1 bit
1 word

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2. Data transmission specifications

Items Specifications
Transmission scheme Half-duplex *: Standard
Synchronization scheme Start-stop synchronization default setting
Communication baud rate 9600/19200*/38400 bps (selectable using a parameter) *1
Communication protocol TOSHIBA Inverter Protocol * / MODBUS-RTU (selectable using a parameter) *1
Character transmission <ASCII mode> JIS X 0201 8-bit (ASCII)
<Binary mode, MODBUS-RTU> Binary codes fixed to 8 bits
Stop bit length Received by inverter: 1 bit, Sent by inverter: 2 bits *3
Error detecting scheme Parity *2: Even */Odd/Non parity (selectable using a parameter) *1,
checksum(Toshiba inverter protocol), CRC(MODBUS-RTU)
Character transmission 11-bit characters *1 (Stop bit=1, with parity)
format
Order of bit transmission Low-order bits transmitted first
Frame length Variable (to a maximum of 17 bytes)
*1: Changes to setting do not take effect until the inverter is turned back on or reset.

*2: JIS-X-0201 (ANSI)-compliant 8-bit codes are used for all messages transmitted in ASCII mode
and vertical (even) parity bits specified by JIS-X-5001 are added to them. These even parity
bits can be changed to odd parity bits by changing the parameter setting (a change to the pa-
rameter setting does not take effect until the inverter has been reset.)

*3: Here are the default character transmission format.

Characters received: 11 bits (1 start bit + 8 bits + 1 parity bit + 1 stop bit)
START PARITY STOP
BIT BIT0 BIT1 BIT2 BIT3 BIT4 BIT5 BIT6 BIT7 BIT BIT
The inverter receives one stop bit.
(The computer can be set so as to send 1, 1.5 or 2 stop bits.)

Characters sent: 12 bits (1 start bit + 8 bits + 1 parity bit + 2 stop bits)
START PARITY STOP STOP
BIT BIT0 BIT1 BIT2 BIT3 BIT4 BIT5 BIT6 BIT7 BIT BIT BIT
The inverter sends two stop bits.
(The computer can be set so as to receive 1, 1.5 or 2 stop bits.)

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3. Communication protocol
This communication protocol supports the TOSHIBA Inverter Protocol and part of MODBUS-RTU
protocol.

Select the desired protocol from in the following communication protocol selection parameters
(, ).

“Parameter Name  and , Communication Number. 0807 and 0829”
Data Range: 0, 1 (Initial value: 0)
0: TOSHIBA (Includes inter-drive communication)
1: MODBUS-RTU

* A parameter change is reflected when the inverter is reset, such as in power off.

3.1. About the handling of received frames

To send and receive data frames, a frame synchronization system for locating the start and end
points of each frame is defined with time for which no data is sent (time interval equivalent to the
time required to send 3.5 bytes of data).
If no data is sent for the time required to send 3.5 bytes of data at the current transmission speed
(approx. 4 ms or more at 9,600 bps or approx. 2 ms or more at 19,200/38,400 bps) after receipt of
a frame, the entire frame is assumed to have reached and information in it is analyzed. For this
reason, an interval corresponding to at least 3.5 bytes of data must be placed between frames.
When sending a significant data set using two or more frames, an interval corresponding to at
least 1.5 bytes of data must be placed between frames. If an interval corresponding to 1.5 bytes or
more is not placed, the contents of a frame are analyzed separately from those of the other frames,
and therefore communication are not carried out normally.
When two or more inverters on the same line are controlled individually one after another, not only
data from the host computer to an inverter but also a response from an inverter to the host com-
puter are transmitted to the other inverters on the line too. Therefore, an interval corresponding to
at least 3.5 bytes should be placed between the time when the host computer receives a response
from an inverter and the time when it sends a frame to the next inverter. Otherwise the return frame
received and the frame that is sent immediately after receipt of the return frame will be recognized
as one frame and communication will not be carried out normally.

[Correct]

Frame B
Frame A

Note: An inverter cannot receive frame

3.5 bytes or more
B before it finishes analyzing the
contents of frame A.
[Wrong] If divided into two smaller frames, frame A cannot be received as a
single frame.

Frame B
Frame A (1/2) Frame A (2/2)

1.5 bytes or more Note: Correct if the interval corresponds

to less than 1.5 bytes of data.

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4. TOSHIBA Inverter Protocol

Select “TOSHIBA” (, =) in the communication protocol selection parameters.
“TOSHIBA” (, =) is set for initial communication protocol selection of shipment
setting. (See “3. Communication protocol.”)

◼ Exchange of data between the computer and the inverter

In communication between the computer and the VF-AS1 (hereinafter referred to as the inverter),
the inverter is always placed in wait states and acts as a slave that operates on a request from the
computer.

A discrimination between ASCII mode and binary mode is automatically made with the start code.

Start code “CR” (carriage return)

ASCII mode “(” Required
Binary mode “2FH(/) ” Not required

(1) If there is no transmission format or the inverter number that matches, an error occurs and no
response is returned.

(2) When an inverter number is added behind the “(” communication will take place only in case of
broadcast communication or if the number matches up with that assigned to the inverters.

(3) When a time-out period is specified with parameter f803 (communication time-out time), a
time-out occurs if communication do not terminate normally within the specified time. With pa-
rameter f804 (communication time-out action), you can specify what the inverter should do if
a time-out occurs. For details, refer to Section 7.3.

(4) On executing the command received, the inverter returns data to the computer. For the re-
sponse time, see Appendix 2, “Response time.”

◼ Note
Communication is not possible for about two seconds after the power is supplied to the inverter un-
til the initial setting is completed. If the control power is shut down due to an instantaneous voltage
drop, communication is temporarily interrupted.

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4.1. Data transmission format

◼ Note: The term “trip status” used in this manual includes retry waiting status and trip retention status.

4.1.1. Data transmission format used in ASCII mode

A communication number is used to specify a data item, all data is written in hexadecimal, and
JIS-X-0201 (ASCII (ANSI))-compliant transmission characters are used.

◼ Computer → Inverter
Omissible in one-to-one communication For the W and P commands only Omissible

(3.5bytes "(" INV-NO CMD Communication No. DATA "&" SUM ")" CR (3.5bytes
Blank) (28H) 2 bytes 1 byte 4 bytes 0 to 4 bytes (26H) 2 bytes (29H) (0DH) Blank)
Checksum area
Omissible

1. “(“ (1 byte) : Start code in ASCII mode

2. INV-NO (2 bytes) : Inverter number (Omissible in one-to-one communication) ... 00 (30H, 30H) to 99 (39H,
39h), *(2AH)
The command is executed only when the inverter number matches up with that specified
using a parameter.
(When * is specified in broadcast communication, the inverter number is assumed to
match if all numbers except * match. When * is specified instead of each digit (two-digit
number), all inverters connected are assumed to match.)
If the inverter number does not match or if the inverter number is of one digit, the data will
be judged invalid and no data will be returned.

3. CMD (1 byte) : Command (For details, see the table below.)

4. Communication No.(4 bytes)

: Communication number (See 11, “Parameter data.”)

5. Data (0 to 4 bytes) : Write data (valid for the W and P commands only)

6. “&” (1 byte) : Checksum discrimination code (omissible. When omitting this code, you also need to omit
the checksum.)

7. Sum (2 bytes) : Checksum (omissible)

Add the ASCII-coded value of the last two digits (4 bits/digit) of the sum of a series of bits
(ASCII codes) from the start code to the checksum discrimination code.
Ex.: (R0000&??) CR
28H+52H+30H+30H+30H+30H+26H=160H
The last two digits represent the checksum. = 60
When omitting the checksum, you also need to omit the checksum discrimination
code.

8. “)” (1 byte) : Stop code (omissible)

9. CR (1 byte) : Carriage return code

◼ Details of commands and data

CMD (1 byte) Write data (0 to 4 bytes) Hexadecimal number

R (52H): RAM read command No data
W (57H): RAM/EEPROM write command Write data (0 to FFFF)
P (50H) RAM write command Write data (0 to FFFF)

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◼ Inverter → computer
At time of broadcast communication, returning of data is not executed, except for the inverters to
be returned, when the inverter number is not matched, and the inverter number has only one char-
acter. This is because there will be a risk of that the returned data may be deformed.

◼ Data returned when data is processed normally (ASCII mode)

Omissible in one-to-one communication Omissible

(3.5bytes "(" INV-NO CMD Communication No. DATA "&" SUM ")" CR (3.5bytes
Blank) (28H) 2 bytes 1 byte 4 bytes 0 to 4 bytes (26H) 2 bytes (29H) (0DH) Blank)
Checksum area
Omissible

1. “(“ (1 byte) : Start code in ASCII mode

2. INV-NO (2 bytes) : Inverter number (omitted if it is not found in the data received) ... 00 (30H, 30H) to 99 (39H,
39H)
If the inverter number matches up with that specified using a parameter, data will be re-
turned to the computer. In broadcast communication, only the destination inverter (with a
number matching up with the smallest effective number) returns data to the computer.
In broadcast communication, no data is returned from any inverters except the inverter
bearing a number that matches up with the smallest effective number.
Ex.: (*2R0000) CR -> (02R00000000) CR)
Data is returned from the inverter with the number 2 only, but no data is returned from
inverters with the number 12, 22 ....

3. CMD (1 byte) : Command ... The command is also used for a check when an inverter is tripped.
Under normal conditions... The uppercase letter R, W or P is returned, depending on the
command received: R, W or P command.
When an inverter is tripped... The lowercase letter r, w or p is returned, depending on the
command received: R, W or P command.
(The command received is returned with 20H added to it.)

4. Communication No.(4 bytes) :

The communication number received is returned.

5. Data (0 to 4 bytes) : Data ... The data read in is returned for the R command, while the data received is re-
turned for the W and P commands. If the data received is composed of less than 4 digits,
it will be converted into 4-digit data and returned.
Ex.: (W123412) CR → (W12340012) CR)

6. “&” (1 byte) : Checksum discrimination code (omitted if it is not found in the data received)

7. Sum (2 bytes) : Checksum ... Omitted if no checksum discrimination code is found in the data received.
ASCII-coded value of the last two digits (4 bits/digit) of the sum of a series of bits (ASCII
codes) from the start code to the checksum discrimination code.

8. “)” (1 byte) : Stop code (omitted if it is not found in the data received)

9. CR (1 byte) : Carriage return code

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• Data returned when data is not processed normally (ASCII mode)
In case an error occurs, communication error command (4EH(N) or 6EH(n)) and the error type
number is returned to the computer in addition to the checksum. At time of broadcast communica-
tion of the binary mode, returning of data is not executed except for the inverter to be returned (in-
verter number 00H) and when the inverter number is not matched. This is because there will be a
risk that the returned data may be deformed.

Omissible Omissible

(3.5bytes “(“ INV-NO “N” or “n” DATA "&" SUM ")" CR (3.5bytes
Blank) (28H) 2 bytes (4EH) (6EH) 4 bytes (26H) 2 bytes (29H) (0DH) Blank)
Checksum area

Omissible

“(“ (1 byte) : Start code in ASCII mode

“N” or “n” (1 byte) :Communication error command ... This is also used for the checking of inverter trip.

“N” for the normal communication and “n” during the inverter trip.

INV-NO (2 bytes) : Inverter number (omitted if it is not found in the data received) ... 00 (30H, 30H) to 99 (39H,
39H)
If the inverter number matches up with that specified using a parameter, data will be re-
turned to the computer. In broadcast communication, only the destination inverter (with a
number matching up with the smallest effective number) returns data to the computer.

Data (4 bytes) : Error code (0000~0004)

0000 ... Impossible to execute (Although communication is established normally, the
command cannot be executed because it is to write data into a parameter whose
setting cannot be changed during operation (e.g., maximum frequency) or the
EEPROM is faulty.)
0001 ... Data error (The data is outside the specified range or it is composed of too many
digits.)
0002 ... Communication number error (There is no communication number that matches.)
0003 ... Command error (There is no command that matches.)
0004 ... Checksum error (The checksum result differs.)

“)” (1 byte) : Stop code ... This code is omitted if it is not found in the data received.

◼ Examples:
(N0000&5C)CR... Impossible to execute (e.g., a change of maximum frequency data during opera-
tion)
(N0001&5D)CR... Data error (Data is outside the specified range.)
(N0002&5E)CR... No communication number (There is no communication number that matches.)
(N0003&5F)CR... There is no command that matches. (Commands other than the R, W and P
commands)
(Ex.: L, S, G, a, b, m, r, t, w ...)
(N0004&60)CR... Checksum error (The checksum result differs.)
No data returned ... Format error or invalid inverter number

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4.1.2. Data transmission format used in binary mode

A communication number is used to specify a data item, data is written in hexadecimal form, and
data in transmission characters are represented by binary codes (HEX codes).

◼ Computer → Inverter (binary mode)

Omissible in one-to-one communication No data for the 52H (R) command

(3.5bytes “/” INV-NO CMD Communication No. DATA SUM (3.5bytes

Blank) (2FH) 1 byte 1 byte 2 bytes 2 bytes 1 byte Blank)

Checksum area Not omissible

1. 2FH (“/”) (1 byte) : Start code in binary mode

2. INV-NO (2 bytes) : Inverter number (Omissible in one-to-one communication) ... 00H to 3FH ,FFH
In case the inverter number is other than FFH (broadcast communication), command is
executed only when the inverter number coincides with the one designated with the panel.
If the inverter number is not matched, it will be judged invalid and the data is not returned.

3. CMD (1 byte) : Command (For details, see the table below.)

52H (R) command: The size of the data following CMD is fixed to 3 bytes. (Communica-
tion number: 2 bytes, checksum: 1 byte)
57H (W), 50H (P) and 47H (G) commands: The size of the data following CMD is fixed to
5 bytes.
(Communication number: 2 bytes, data: 2 byte, checksum: 1 byte)
Any command other than the above is rejected and no error code is returned.

4. Communication No.(2 bytes)

: Communication number (See 11, “Parameter data.”)

5. Data (2 bytes) : 0000H to FFFFH

57H (W) and 50H (P) commands: Write data (An area check is performed.)
47H (G) command: Dummy data (e.g., 0000) is needed.
52H (R) command: Any data is judged invalid. (No data should be added.)

6. Sum (2 bytes) : Checksum (not omissible) 00H to FFH

Value of the last two digits (1 byte) of the sum of a series of bits (codes) from the start
code of the data returned to the data (or to the communication number for the 52H (R)
command)
Ex.: 2F 52 00 ?? ... 2FH+52H+00H+00H=81H
The last two digits (??) represent the checksum= 81

◼ Details of commands and data

CMD (1 byte) Write data (2 bytes) Hexadecimal number

52H (R): RAM read command No data
57H (W): RAM/EEPROM write command Write data (0000H to FFFFH)
50H (P): RAM write command Write data (0000H to FFFFH)
47H (G): RAM read command (for two-wire networks) Dummy data (0000H to FFFFH)

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◼ Inverter → computer (binary mode)

At time of broadcast communication of the binary mode, returning of data is not executed except
for the inverter to be returned (inverter number 00H) and when the inverter number is not matched.
This is because there will be a risk that the returned data may be deformed.

• Data returned when data is processed normally (Binary mode)

Omissible

(3.5bytes “/” INV-NO CMD Communication No. DATA SUM (3.5bytes

Blank) (2FH) 1 byte 1 byte 2 bytes 2 bytes 1 byte Blank)

Checksum area Not omissible

1. 2FH (“/“) (1 byte) : Start code in binary mode

2. INV-NO (2 bytes) : Inverter number... 00H to 3FH (The inverter number is omitted if it is not found in the data
received.)
If the inverter number matches up with that specified from the operation panel, data will be
returned from the inverter. If the inverter number does not match, the data will be invalid
and no data will be returned.

3. CMD (1 byte) : Command...The command is also used for a check when the inverter is tripped.
Under normal conditions...52H (R), 47H (G), 57H (W) or 50H (P) is returned, depending
on the command received.
When the inverter is tripped...The lowercase letter 72H (r), 67H (g), 77H (w) or 70H (p) is
returned with 20H added to it, depending on the command received.

4. Communication No. (4 bytes)

: The communication number received is returned.

5. Data (2 bytes) : Data ... 0000H to FFFFH

The data read is returned for the 52H (R) and 47H (G) commands, while the data written
is returned for the 57H (W) and 50H (P) commands.

6. Sum (1 bytes) : Checksum (not omissible) 00H to FFH

Value of the last two digits (1 byte) of the sum of a series of bits (codes) from the start
code to the data.

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2) Error Processing (Binary mode)
In case an error occurs, communication error command (4EH(N) or 6EH(n)) and the error type
number is returned to the computer in addition to the checksum. At time of broadcast communica-
tion of the binary mode, returning of data is not executed except for the inverter to be returned (in-
verter number 00H) and when the inverter number is not matched. This is because there will be a
risk that the returned data may be deformed.

Omissible

(3.5bytes “/” INV-NO Norn DATA SUM (3.5bytes

Blank) (2FH) 1 byte (4EH)(6EH) 2 bytes 1 byte Blank)

Checksum area Not omissible

Norn (1 byte) : Communication error command ... This command is also used for a check when the in-
verter is tripped.
“4EH (N)” is returned under normal conditions, while “6EH (n)” is returned when the in-
verter is tripped.
Data (2 bytes) : Error code (0000~0004)
0000 ... Impossible to execute (Although communication is established normally, the
command cannot be executed because it is to write data into a parameter whose
setting cannot be changed during operation (e.g., maximum frequency) or the
EEPROM is faulty.)
0001 ... Data error (The data is outside the specified range or it is composed of too many
digits.)
0002 ... Communication number error (There is no communication number that matches.)
0004 ... Checksum error (The checksum result differs.)

No code returned ...Command error, format error (failure to receive the specified number
of bytes within 0.5 seconds, or an parity, overrun or framing error) or
the inverter number does not match or an inverter in broadcast com-
munication in the binary mode except for the inverter for data returning
(the inverter numbered 00H).

◼ Examples:
2FH, 4EH, 00H, 00H, 7DH ... Impossible to execute (e.g., a change of maximum frequency data
during operation)
2FH, 4EH, 00H, 01H, 7EH ... Data setting error (The data specified falls outside the specified
range.)
2FH, 4EH, 00H, 02H, 7FH ... No communication number (There is no communication number that
matches.)
2FH, 4EH, 00H, 04H, 81H ... Checksum error (The checksum result differs.)

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4.1.3. Transmission format of Block Communication

What is block communication?
Data can be written in and read from several data groups set in one communication by setting the
type of data desired for communication in the block communication parameters (, ,
 to ) in advance. Block communication can save the communication time.

Data is transmitted hexadecimal using the binary (HEX) code transmission characters. “Comput-
er → inverter” is for writing only, while “Inverter → computer” for reply is for reading only.

◼ Computer → Inverter (Block Communication)

Omissible Number of writing data groups x 2 bytes

(3.5bytes Start INV-NO CMD Num- Num- Write Write Write Write SUM (3.5bytes
Blank) Code “X” ber of ber of data1 data1 data2 data2 Blank)
write read
“／” High Low High Low
data data
groups groups
Checksum Area

1. 2FH(“/”) (1 byte) : Start code of binary mode

2. INV-NO (1 byte) : Inverter number. (Can be omitted in 1:1 communication): 00H to 3FH, FFH
Executed only when the inverter number matches the inverter number. Set on the panel,
except in FFH (broadcast communication).
Communication data will be invalidated and data will not be returned either if the inverter
number. Does not match.

3. CMD (1 byte) : ‘X’ (Block communication command)

4. Number of write data groups (1 byte)

: Specify the number of data groups to be written (00H to 02H).
If specified outside of the range, data will be treated as a format error and data will not be
returned.

5. Number of read data groups (1 byte)

: Specify the number of data groups to be read (00H to 05H).
If specified outside of the range, data will be returned as “Number of read data groups = 0”
when returned by the inverter.

6. Write data1 (2 bytes)

: Needed when the number of write data groups is larger than 1.
Data to be written to the specified parameter selected by 
Dummy data is needed if the number of write data groups is larger than 1 even
though(none) is selected for 

7. Write data2 (2 bytes)

: Needed when the number of write data groups is 2.
Data to be written to the specified parameter selected by 
Dummy data is needed if the number of write data groups is 2 even though(none) is se-
lected for 

8. SUM (1 byte) : Checksum (Cannot be omitted) 00H to FFH

Lower two digits (1 byte) of total sum from start code (SUM value not included)

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 E6581315
◼ Block Write 1, 2

Select data, which is desired to be written in block communication, in block write Data 1 and 2 Pa-
rameters (, ). This parameter becomes effective when the system is reset, such
as when power is turned off. When the setting is completed, turn off and then on the power.

If the command is controlled from 2 wire RS485 communication, set 2: “2 wire RS485 communica-
tion input” to cmod or Bit 15 of FA00 is ON. If the frequency is controlled from 2 wire RS485
communication, set 5: “2 wire RS485 communication input” to fmod or Bit 14 of FA00 is ON.

No. Block Write Data For data details, see:

0 Deselect －
1 Command information 1 (FA00)
2 Command information 2 (FA20)
3 Frequency Command (FA01)
“8.1 Command by communication”
4 Terminal board output data (FA50)
5 Communication analog output (FA51)
6 Motor speed command (FA13)

* When “Deselect” is specified in the parameters, no data will be written even though write data is
specified.

◼ Block Read 1 to 5

Select read data, which is desired to be read in block communication, in block read data 1 and 5
Parameters (to). This parameter becomes effective when the system is reset,
such as when power is turned off. When the setting is completed, turn off and then on the power.

No. Block Read Data For data details, see:

0 Deselect －
1 Status information (FD01)
2 Output frequency (FD00)
3 Output current (FD03)
4 Output voltage (FD05)
5 Alarm Information 1 (FC91)
6 PID feedback value (FD22)
7 Input terminal board monitor (FD06)
“8.2 Monitoring from communication”
8 Output terminal board monitor (FD07)
9 V/II terminal boad monitor (FE36)
10 RR/S4 terminal board monitor (FE35)
11 RX terminal board monitor (FE37)
12 Input voltage (DC detection) (FD04)
13 Speed feedback frequency (FD16)
14 Torque (FD18)
15 My monitor 1 (FE60) －
16 My monitor 2 (FE61) －
17 My monitor 3 (FE62) －
18 My monitor 4 (FE63) －
19 Free notes (F880) “7.5 Free notes ()”
20 Output motor speed monitor (FE90) “8.2 Monitoring from communication”
* V/II terminal board monitor (FE36), RR/S4 terminal board monitor (FE35) and RX terminal board
monitor (FE37), Output motor speed monitor (FE90) will become hold data during a trip. Other-
wise, real-time data appears.
* “0000” will be returned as dummy data, if “0 (Deselect)” is selected for the parameter and “read”
is specified.

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 E6581315

◼ Inverter → Computer
At time of broadcast communication of the binary mode, returning of data is not executed except
for the inverter to be returned (inverter number 00H) and when the inverter number is not matched.
This is because there will be a risk that the returned data may be deformed.

1) Normal processing

Omissible Number of read data groups x 2

bytes
(3.5 Start INV CMD Number Write Read Read Read Read Read Read Read Read Read Read SUM (3.5
bytes Code No. “Y” of Read Status data1 data1 data2 data2 data3 data3 data4 data4 data5 data5 bytes
Blank) “/” Data
high low high low high low high low high low Blank)
Groups

Checksum area

1. 2FH “/” (1 byte) ：Start code in binary mode

2. INV-NO (1Byte) ：Inverter number･･･00H to 3FH
If the inverter number matches up with that specified from the operation panel, data
will be returned from the inverter. If the inverter number does not match, the data will
be judged invalid and no data will be returned.
Communication data will be invalidated and data will not be returned either if the in-
verter number does not match. (Inverter number is considered matched if it is omit-
ted during reception)

3. CMD(1Byte) :‘Y’ (Block communication command [monitoring])

Lowercase letter ‘y’ during an inverter trip, including standing by for retrying and dur-
ing a trip.
4. Number of read data groups (1 byte)
: Return the number of data groups to be read (00H to 05H).
5. Write status (1 byte) : Return 00H to 03H.
* Failing to write in the specified parameter in the number of write data groups, set “1”
in the corresponding bit for the parameter failed to write. (See below.)

Bit Position 7 6 5 4 3 2 1 0
Data Type －  

6. Read data1 - 5 (2 bytes)

: Return according to the number of read data groups. “0000H” is returned as dummy
data if “0” is selected as a parameter.
Read data1: Data selected by . Read data2: Data selected by .
Read data3: Data selected by . Read data4: Data selected by .
Read data5: Data selected by .
7.SUM(1Byte) : Checksum (Cannot be omitted) 00H to FFH
Lower two digits (1 byte) of total sum from start code of return data to read data.

◼ Example
(When set as follows:  =  (Command information 1),  =  (frequency command),
 =  (status information), =  (output frequency),  =  (output current),  =  (output
voltage) and  =  (alarm information)
Computer → Inverter：2F 58 02 05 C4 00 17 70 D9
Inverter → Computer：2F 59 05 03 00 00 00 00 00 00 00 00 00 00 90 (When parameter is not set)
Inverter → Computer：2F 59 05 00 40 00 00 00 00 00 00 00 00 00 CD CD (When parameter is set)
Inverter → Computer：2F 59 05 00 64 00 17 70 1A 8A 24 FD 00 00 3D (During operation at 60Hz)

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 E6581315
2) Error Processing (Binary mode)
In case an error occurs, communication error command (4EH(N) or 6EH(n)) and the error type
number is returned to the computer in addition to the checksum.

Omissible

(3.5bytes “/” INV-NO Norn DATA SUM (3.5bytes

Blank) (2FH) 1 byte (4EH)(6EH) 2 bytes 1 byte Blank)

Checksum area Not omissible

“N” or “n” (1 byte) : Communication error command. Also for check during an inverter trip (includes standing
by for retrying and trip holding). “4EH (N)” when normal, “6EH (n)” during an inverter trip.

DATA (2 bytes) : Error code (0004)

0004 : Checksum error (The checksum does not match)
No return : Command error, format error (specified number of bytes is not received in 1sec,
or parity error, overrun error or framing error), inverter number mismatch, and
inverter number other than 00H in broadcast communication.

◼ Examples
Computer → Inverter : 2F 58 02 05 C4 00 17 70 D8
Inverter → Computer : 2F 4E 00 04 81 ... Checksum error

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 E6581315

4.2. Commands
Here are the communication commands available.
Command Function
R command Reads the data with the specified communication number.
W command Writes the data with the specified communication number. (RAM and EEPROM).
P command Writes the data with the specified communication number. (RAM).
Reads the data with the specified communication number. (For binary mode only.
G command
Dummy data is required for this command.)
X command Block communication (Computer -> Inverter)
Y command Block communication (Inverter -> Computer)

◼ W (57H) (RAM*1 /EEPROM*2 write)

This command is used to write new data into the parameter specified using it communication
number. It writes data into the RAM and EEPROM. For parameters whose settings cannot be
stored in the EEPROM (e.g., parameter with the communication number FA00), the W (57H)
command writes data into the RAM only. It cannot be used to write data into read-only parameters
(e.g., parameter with the communication number FD?? or FE??).
Each time an attempt to write data is made, the inverter checks if the data falls within the specified
range. If this check reveals that the data falls outside the specified range, the inverter will reject it
and return an error code.

- Ex.: Setting the deceleration time (communication number: 0010) to 10 sec.

<ASCII mode> CR: Carriage return
Computer → Inverter Inverter → Computer
(W00100064)CR (W00100064)CR …(100.1=100=0064H)
<Binary mode>
Computer → Inverter Inverter → Computer
2F 57 00 10 00 64 FA 2F 57 00 10 00 64 FA …(100.1=100=0064H)

Notice
 Do not write the same parameter to the EEPROM more than 10,000 times. The life time of EEPROM is
approximately 10,000 times.(Some parameters are not limited, please refer to the “9.Parameter data “)
The lifetime of EEPROM is approximately 10,000 times. When using the TOSHIBA inverter protocol
and the data does not need to be records, use P command (the data is written only to RAM).

◼ Explanation of terms
*1: The RAM is used to temporarily store inverter operation data. Data stored in the RAM is cleared
when the inverter is turned off, and data stored in the EEPROM is copied to the RAM when the
inverter is turned back on.
*2: The EEPROM is used to store inverter operation parameter settings, and so on. Data stored in
the EEPROM is retained even after the power is turned off, and it is copied to the RAM when
the inverter is turned on or reset.

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 E6581315

◼ P (50H) (RAM*1 write)

This command is used to rewrite data into the parameter specified using a communication number.
It writes data into the RAM only. It cannot be used to write data into any read-only parameters.
Each time an attempt to write data is made the inverter checks whether the data falls within the
specified range. If this check reveals that the data falls outside the range, the inverter will reject it
and return an error code.

- Ex.: Entering the emergency stop command (communication number: FA00) from the computer
<ASCII mode>
Computer → Inverter Inverter → Computer
(PFA009000)CR (PFA009000)CR …Command priority, emergency stop
command
<Binary mode>
Computer → Inverter Inverter → Computer
2F 50 FA 00 90 00 09 2F 50 FA 00 90 00 09

◼ R (52H) (Data read)

This command is used to read the setting of the parameter specified using a communication num-
ber.

- Ex.: Monitoring the electric current (communication number: FE03)

<ASCII mode>
Computer → Inverter Inverter → Computer
(RFE03)CR (RFE03077B)CR …Current: 1915 / 100 = 19.15%
<Binary mode>
Computer → Inverter Inverter → Computer
2F 52 FE 03 82 2F 52 FE 03 07 7B 04

◼ G (47H) (Data read)

This command is used to read the parameter data specified using a communication number. Alt-
hough this command is used for the previous model to control the operation of two or more invert-
ers in binary mode through a two-wire RS485 network, the “R” command can also be used without
problems for the VF-AS1 series.
To use the “G” command, however, dummy data (2 bytes) is needed.
This command is available only in binary mode.

- Ex.: Monitoring the electric current (communication number: FE03)

Computer → Inverter Inverter → Computer
2F 47 FE 03 00 00 77 2F 47 FE 03 07 7B F9
* In this example, the data 00H sent from the computer to the inverter is dummy data.

◼ S (53 H)/ s (73 H) Inter-drive communication command(RAM*1 Write)

This command is for using frequency command values in % (1 = 0.01%), instead of in Hz, and is
for synchronous-proportional operation in inter-drive communication. This command can also be
used in ordinary computer link communication.
When writing in the frequency command (FA01, FA05) is enabled and a parameter other than it is
specified, a communication number error will result. Data is written in the RAM only and at this
time the data check such as an upper limit and lower limit checking is not carried out.
Data is not returned from the inverters while this command is used. This command can be used
only in the binary mode.
For the details of the format, see “6.2 Transmission format for inter-drive communication.”
Use (%) as the unit for frequency command values specified by the command S, instead of (Hz),
and the receiving side converts units for frequency values to “Hz” in accordance with the point
conversion parameter. The conversion formula is shown below.

Frequency command value (Hz) =

Point 2 frequency (F813) − Point 1 frequency (F812)
x (Frequency command value (%)
Point 2 (F814) − Point 1 (F811)
− Point 1 (F811) + Point 1 frequency (F812)

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 E6581315
When Command “s” (lowercase letter) is received, the slave side judges that the master side is
tripped and operates in accordance with the inter-drive communication parameter (,
).
For detail, see "7. Communication parameters ".

- Examples: 50% frequency command (2-wire RS485 communication)

(If maximum frequency = Frequency for operation at 80Hz = 40Hz: 50% = 5000d = 1388H)

<Binary mode>

Master inverter → Slave inverter Slave inverter → Master inverter

2F 53 FA 01 13 88 18 No return

◼ X(58H)/Y (59H) (Block Communication Command)

Data selected in the block communication write parameters (,) is written in the
RAM. When returning data, data selected in block communication read parameters ( to
) is read and is returned.

For detail, see "4.1.3. Transmission format of Block Communication ".

- Examples: 60Hz operation command from communication and monitoring (Monitoring when al-
ready operating at 60Hz)
(Parameter Setting:  = , = ,  = ,  = ,  = ,  =
, = )

<Binary mode>
Computer → Inverter Inverter → Computer
2F 58 02 05 C4 00 17 70 D9 2F 59 05 00 64 00 17 70 1A 8A 24 FD 00 00 3D

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 E6581315

4.3. Transmission errors

◼ Table of error codes

Error name Description Error code

Impossible to exe- The command is impossible to execute, though communication 0000
cute was established normally.
1 Writing data into a parameter whose setting cannot be changed
*1
during operation (e.g., maximum frequency)
2 Writing data into a parameter while “” is in progress
Data error Invalid data is specified. 0001
Communication There is no communication number that matches. 0002
number error
Command error The command specified does not exist. 0003 (ASCII mode)
No code returned (Binary
mode)
Checksum error The Checksum does not match. 0004
Format error The data transmission format does not match. No code returned
1 One-digit inverter number (ASCII mode)
2 The CR code is found in the designated position. (ASCII mode)
Ex.: Communication number of 4 digit or less. In the case of
(R11) CR, 11) CR is recognized as a communication number
and the CR code is not recognized, with the result that a
format error occurs.
3 A code other then the stop code (“)”) is entered in the stop code
position.
Receiving error A parity, overrun or framing error has occurred. *2 No code returned
*1: For parameters whose settings cannot changed during operation, see ”Table of parameters.”
*2: Parity error : The parity does not match.
Overrun error : A new data item is entered while the data is being read.
Framing error : The stop bit is placed in the wrong position.

* For the errors with “no code returned” in the above table, no error code is returned to avoid a
data crash.
If no response is received, the computer side recognizes that a communication error has oc-
curred. Retry after a lapse of some time.

* If the inverter number does not match, no processing will be carried out and no data will be re-
turned, though it is not regarded as an error.

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 E6581315

4.4. Broadcast communication function

Broadcast communication function can transmit the command (write the data) to multiple inverters
by one communication. Only the write (W, P) command is valid and the read (R, G) command is
invalid. The inverters subject to the broadcast communication are the same to the independent
communication; 0 to 99 (00H - 63H) in the ASCII mode, and 0 to 63 (00H - 3FH) in the binary
mode. To avoid data deforming, the inverters to return data will be limited.

◼ “Overall” broadcast communication (ASCII mode / Binary mode)

- ASCII Mode
If you enter two asterisks (**) in the inverter number position of the data transmission format, the
computer will send the data simultaneously to all inverters (with an inverter number between 0 and
99 (00 to 63H)) on the network.

- Binary Mode
To put "FF" to the specified place of the inverter number in the communication format validates the
broadcast communication and the command is transmitted to all the applicable inverters in the
network (inverter numbers from 0 to 63 (00 to 3FH)).

<Inverter that returns data to the computer>

Data is returned from the inverter bearing the inverter number 00 only.
If you do not want inverters to return data, do not assign the number 00 to any inverter on the net-
work.

◼ “Group” broadcast communication (ASCII mode only)

If you put “*?” In the inverter number position of the data transmission format, data will be sent
simultaneously to all inverters bearing a number whose digit in the one’s place in decimal notation
is”?”
If you put ”?*” In the inverter number position of the data transmission format, the data will be sent
simultaneously to all inverters bearing a number whose digit in the ten’s place in decimal notation
is”?”.
(“?”: Any number between 0 and 9.)

<Inverter that returns data to the computer>

Data is returned only from the inverter bearing the smallest number in the same group of inverters
(i.e., inverter whose number in the position of ”*” is 0).
If you do not want inverters to return data to the computer, do not assign a number having a 0 in
the position of “*” to any inverter on the network.)
◼ Examples of broadcast communication
Ex: Set the frequency setting for communication to 60Hz.

1 Host computer → Multiple inverters: broadcast communication (ASCII Mode)

Example of transmission of data from host computer to inverter: (**PFA011770)CR
Example of data returned from inverter to host computer: (00PFA011770)CR
Data is returned from the inverter numbered 00 only, while commands are issued to all inverters
connected to the network.

2 Host computer → A specific group of inverters: group communication (ASCII Mode)

Example of transmission of data from host computer to inverters: (*9PFA011770)CR
Example of data returned from inverter to host computer: (09PFA011770)CR
Data is returned only the inverter numbered 09 only, while commands are issued to a maximum
of 10 inverters bearing the number 09, 19, 29, 39, ... or 99.

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 E6581315

Host
computer

Block 1 Block 2

Inverter No. 10 Inverter No.11 Inverter No.19 Inverter No.20 Inverter No.21 Inverter No.29

VF-AS1 VF-AS1 VF-AS1 VF-AS1 VF-AS1 VF-AS1

*1
*1: Error signal I/F

In broadcast communication, only the representative inverter in each block returns data to the host
computer. However, you can make the representative inverter in each block report the occurrence
of a problem in the block. To do so, follow these steps.

Set the timer function so that, if a time-out occurs, the inverter will trip (Ex.: = (sec)), set
the output terminal selection parameter (FL) so that trip information will be output through the out-
put terminal (=), and set the input terminal selection parameter (F) of the representa-
tive inverter in each block to “external input trip (emergency stop)” (=). Then, connect
the input terminal (F, CC) of the representative inverter to the FL terminal (FLA, FLC) of each of
the other inverters in the same block (FLA-F, FLC-CC). In this setting, if an inverter trips, the rep-
resentative inverter will come to an emergency stop, and as a result it will report the occurrence of
a problem in its block to the computer. (If the representative inverter returns a lowercase letter in
response to a command from the computer, the computer will judge that a problem has arisen in
an inverter.) To examine details on the problem that has arisen, the host computer accesses each
individual inverter, specifying its communication number. To make the computer issue a command
to all inverters in block 1 or block 2 shown in the figure above, specify “1*” or “2*”, respectively. In
this system, inverter No. 10 will return data to the computer if a problem arises in block 1, or in-
verter No. 20 if a problem arises in block 2. For overall broadcast communication, specify “**”, in
which case the inverter with the communication number “00” will return data to the computer.

In this example, if you want the computer to maintain communication without bringing an repre-
sentative inverter to an emergency stop, set its input terminal selection parameter to “disabled
(=) but not to “external input trip (emergency stop).” This setting causes the host com-
puter to check the setting of the input terminal information parameter (Communication No.=DF06,
bit 0) of the representative inverter, and as a result enables the computer to detect the occurrence
of a problem.

CAUTION:
Data from inverters will be deformed if inverters of the same number are connected on the network.
Never assign same single numbers to inverters on the network.

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 E6581315

4.5. Examples of the use of communication commands

Here are some examples of the use of communication commands provided for the VF-AS1 series
of inverters.
Inverter numbers and checksum used in ASCII mode are omitted from these examples.

◼ Examples of communication
- To run the motor in forward direction with the frequency set to 60 Hz from the computer
<ASCII mode>
Computer → Inverter Inverter → Computer
(PFA011770)CR (PFA011770)CR …Set the operation frequency to 60 Hz.
(60 / 0.01 Hz = 6000 = 1770H)
(PFA00C400)CR (PFA00C400)CR …Set to “forward run” with commands and frequen-
cy instruction from the computer enabled.
<Binary mode>
Computer → Inverter Inverter → Computer
2F 50 FA 01 17 70 01 2F 50 FA 01 17 70 01
2F 50 FA 00 C4 00 3D 2F 50 FA 00 C4 00 3D

- To monitor the output frequency (during 60 Hz operation)

<ASCII mode>
Computer → Inverter Inverter → Computer
(RFD00)CR (RFD001770)CR …Set the operation frequency to 60 Hz.
(600.01Hz=6000=1770H)
<Binary mode>
Computer → Inverter Inverter → Computer
2F 52 FD 00 7E 2F 52 FD 00 17 70 05

- To monitor the status of the inverter

<ASCII mode>
Computer → Inverter Inverter → Computer
(RFD01)CR (rFD010003)CR …For details on statuses, see 8.2 “Monitoring from
the computer.” (Stop status, FL output status, trip
status (r command))

<Binary mode>
Computer → Inverter Inverter → Computer
2F 52 FD 01 7F 2F 72 FD 01 00 03 A2

- To check the trip code (when the inverter is tripped because of )
…For details on trip codes, see “Trip code monitor” in 8.2, “Monitoring
from the computer.” (18H = 24d “” trip status)
<ASCII mode>
Computer → Inverter Inverter → Computer
(RFC90)CR (rFC900018)CR

<Binary mode>
Computer → Inverter Inverter → Computer
2F 52 FC 90 0D 2F 72 FC 90 00 18 45

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 E6581315

4.6. Examples of Communication programs

According to the hardware configuration of the computer used, select a serial output port. To use
an RS232C port on the computer, you will have to prepare an RS232C-RS485 conversion unit
separately.
An USB-RS485 conversion unit (USB0001Z) is available as our standard offering.

Ex. 1: BASIC program for monitoring the output frequency continuously (RS232C, ASCII mode)
(Toshiba version of Advanced BASIC-86 Ver. 3.01.05J)

 Monitoring the output frequency continuously

1) Examples of programs
10 OPEN "COM1:9600,E,8,1" AS #1 --- 9600 baud, even parity, 8-bit length, 1 stop
bit
20 A$=”FE00” --- Specifies the communication number for
monitoring the output frequency.
30 PRINT #1,"("+”R”+A$+")" --- Transmits data to the inverter.
Note: The carriage return code is added au-
tomatically.
40 INPUT#1,B$ --- Receives data returned from the inverter.
50 AAA$=“&H”+MID$(B$,7,4) --- Extracts only data items from the data re-
turned.
60 F$=LEFT$(STR$(VAL(AAA$)/100),6) --- Converts data into decimal form.
70 PRINT " Output frequency =";F$+“Hz” --- Displays the output frequency.
80 GOTO 20 --- Repeats.

2) Examples of program execution results (stop command issued during 80 Hz operation)

Output frequency = 80 Hz ...
Output frequency = 79.95Hz
:
:
Output frequency = 0Hz

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 E6581315
Ex. 2: BASIC program for executing an input command with checksum (RS232C, ASCII mode)
(Toshiba version of Advanced BASIC-86 Ver. 3.01.05J)
 Checking if the maximum frequency setting has been changed correctly
1) Examples of programs
10 OPEN "COM1:9600,E,8,1" AS #1 --- 9600 baud, even parity, 8-bit length, 1 stop
bit
20 INPUT"Send Data=";A$ --- Reads in data to be sent to the inverter.
30 S$="("+A$+"&" --- Adds “(“ and “&” to the read data in.
40 S=0
50 L=LEN(S$)
60 FOR I=1 TO L Calculates the number of bits (checksum).
70 S=S+ASC(MID$(S$,I,1))
80 NEXT I
90 CHS$=RIGHT$(HEX$(S),2)
100 PRINT #1,"("+A$+"&"+CHS$+")" --- Sends the data including the checksum re-
sult to the inverter.
110 INPUT #1,B$ --- Receives data returned from the inverter.
120 PRINT "Receive data= ";B$ --- Displays the data received.
130 GOTO 20 --- Repeats.

2) Examples of program execution results

Send Data=? R0011 --- Reads the maximum frequency (0011).
Receive Data= (R00111F40&3D) --- 1F40 (Maximum frequency: 80 Hz)
Send Data=? W00111770 --- Changes the maximum frequency to 60 Hz
(1770).
Receive Data= (W00111770&36)
Send Data=? R0011 --- Reads the maximum frequency (0011).
Receive Data= (R00111770&31) --- 1770 (Maximum frequency: 60 Hz)

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 E6581315
Ex. 3 BASIC program for communication tests (RS232C, ASCII mode)
(Toshiba version of Advanced BASIC-86 Ver. 3.01.05J)
 Accessing a parameter (with error code.)
1) Examples of programs
100 INPUT "Baud rate=9600/4800/2400/1200";SPEED$
---- Selects a baud rate.
110 INPUT "Parity=even(E)/odd(O)";PARITY$
---- Selects parity.
120 OPEN "COM1:"+SPEED$+","+PARITY$+",8,1"AS #1
130 INPUT "Send data";B$ ---- Enters a command.
140 PRINT #1,B$
150 C$=""
160 T=TIMER
170 COUNT=(TIMER-T)
180 IF COUNT >3 THEN 270
190 IF COUNT <0 THEN T=TIMER ---- Prevents an increase in the number of digits.
200 IF LOC(1)= 0 THEN A$="":GOTO 220
210 A$=INPUT$(1,#1)
220 IF A$ <>CHR$(13) THEN 240 ---- Carriage return
230 GOTO 290 (CR) to finish reading in.
240 IF A$="" THEN 160
250 C$=C$+A$
260 GOTO 160
270 COLOR @0,7:PRINT "!!! There is no data to return. !!! ";:COLOR @7,0:PRINT
280 GOTO 130 ---- Repeats.
290 PRINT A$;
300 C$=C$+A$
310 PRINT "Return data=";c$;
320 GOTO 130 ---- Repeats.

2) Examples of program execution results (In this example, the inverter number is 00.)
Baud rate=9600/4800/2400? 9600 ---- Selects 9600 baud.
Parity=even(E)/odd(O)? E ---- Select E (even parity).
Send data? (00R0011) ---- Carries out test communication.
Return data= (00R00111770)
Send data? () ---- Error
!!! There is no data to return. !!! ---- No data is returned.
Send data? (R0011)
Return data= (R00111770)
Send data?
:
:

26
 E6581315
Ex. 4 A VisualBaisc program for the ASCII mode communication
(VisualBaisc is the registered trademark of the U.S. microsoft company.)

 Accessing a parameter

1) Sample program executive example (Monitor of the output frequency (FD00))

Transmission and reception of the optional data like in the following example can be done by
doing "the arrangement of the form control" of the explanation and "the description of the code"
with mentioning later.

Reply data from the inverter

are 1770H (6000d) with this
example.
As for the unit of the output
frequency (FD00),1=
0.01Hz,
the Inverter is being operat-
ed in 60.00Hz.

2)Arrangement of the control on the form

Two TextBox, two Labels , three CommandButton and one MsComm are arranged on the form
as follows.

27
 E6581315
3)The description of the code

Private Sub Form_Load()

Form1.Show

'**********************************************************************
' Setting the labels (Initialization)
'**********************************************************************
Label1.Caption = "Data for transmission"
Label2.Caption = "Received data"
Command1.Caption = "Transmit"
Command2.Caption = "Clear"
Command3.Caption = "Exit"

'**********************************************************************
' Setup of communication (Initialization)
'**********************************************************************
MSComm1.RThreshold = 0
MSComm1.InputLen = 1
MSComm1.CommPort = 1
MSComm1.InBufferCount = 0
MSComm1.OutBufferCount = 0
Form1.MSComm1.Settings = "9600,E,8,1"
Form1.MSComm1.InputMode = comInputModeText

'**********************************************************************
' A serial port is opened. (Initialization)
'**********************************************************************
If False = MSComm1.PortOpen Then
MSComm1.PortOpen = True
End If

'**********************************************************************
' Data are received.
'**********************************************************************
Do
dummy = DoEvents()
If MSComm1.InBufferCount Then
Text1.Text = Text1.Text & MSComm1.Input
End If
Loop
End Sub

'**********************************************************************
' The contents of the text box are transmitted.
'**********************************************************************
Private Sub Command1_Click()
MSComm1.Output = Text2.Text & Chr(13)
End Sub

'**********************************************************************
'The contents of the text box are removed.
'**********************************************************************
Private Sub Command2_Click()
Text2.Text = ""
Text1.Text = ""
End Sub

'**********************************************************************
'A serial port is closed, end
'**********************************************************************
Private Sub Command3_Click()
If True = MSComm1.PortOpen Then
MSComm1.PortOpen = False
End If
End
End Sub

28
 E6581315

5. MODBUS-RTU protocol
The MODBUS-RTU protocol of VF-AS1 supports only part of the MODBUS-RTU protocol. Only
two commands are supported, “03: Multiple data read (limited only to two bytes)” and “06: Word
writes.” All data will be binary codes.

◼ Parameter Setting

• Protocol selection (, )

Select “MODBUS－RTU (,  = ) in the communication selection parameters.
“TOSHIBA” (, =) is set for communication protocol selection in initial shipment
setting. (See “3. Communication protocol.”)
* Caution when selecting MODBUS-RTU
Note that selecting this protocol disables the inter-drive communication functions set with parame-
ters  and , and the block communication functions set with parameters ,
 and  to .

• Inverter number ()

Inverter numbers. 0 to 247 can be specified in MODBUS-RTU. “0” is allocated to broadcast
communication (no return). Set between 1 and 247.

<Related Parameter: Change and set as necessary>

 : Baud rate (2-wire RS485) : Communication speed (4-wire RS485)

Before CPU1 Ver.153

 : Parity (common to 2-wire RS485 and 4-wire RS485) See “7.1”.

Ａｆｔｅｒ CPU1 Ver.154
 : Parity (2-wire RS485), : Parity (4-wire RS485) See “7.1”.

◼ Data Exchange with Inverters

The inverters are always ready to receive messages and perform slave operation in response to
computer requests.
A transmission error will result if the transmission format does not match. The inverters will not
respond if a framing error, parity error, CRC error or an inverter number mismatch occurs. If no re-
sponse is received, the computer side recognizes that a communication error has occurred.
Transmit data again.

(1) In case spacing for more than 3.5 bytes are provided before characters, all data immediately
preceding it will be aborted. Data will sometimes be aborted if spacing for 1.5 bytes or more is
provided between characters. (See “3.1. About the handling of received frames.”)
(2) Communication will be effective only when inverter numbers match or the communication mode
is 0 (Broadcast communication). If there is no inverter number that matches or 0 (broadcast
communication) is specified, no response is returned by any inverter.
(3) Message reception will end if spacing for more than 3.5 bytes are provided at the end of char-
acters. (See “3.1. About the handling of received frames.”)
(4) If no communication take place within the time specified using the timer function, the computer
will assume that a communication error has occurred and trip the inverter. The timer function is
disabled when the inverter is turned on or initialized. For details, see Section 7.3, “Timer func-
tion, Communication time-out time action.”
(5) On executing the command received, the inverter returns data to the computer. For the re-
sponse time, see Appendix 2, “Response time.”

◼ Caution:
Communication is not possible for about two seconds after the power is supplied to the inverter un-
til the initial setting is completed. If the control power is shut down due to an instantaneous voltage
drop, communication is temporarily interrupted.

29
 E6581315

5.1. MODBUS-RTU transmission format

MODBUS-RTU sends and receives binary data without a frame-synchronizing start code and de-
fines the blank time to recognize the start of a frame. MODBUS-RTU decides the data that is first
received subsequently as the first byte of a frame after a blank time for 3.5 bytes at the on-going
communication speed.

5.1.1. Read command (03)

◼ Computer → Inverter *The text size is 8 bytes fixed.

Commu- Commu- Number Number

Inverter nication nication of Data of Data CRC CRC
(3.5bytes Command (3.5bytes
No. No. No. Groups Groups (low) (high)
Blank) (high) (low) (high) (low) Blank)
03 00 01

1) Inverter No.. (1 byte) : Specify an inverter number between 0 and 247 (00H to F7H).
Command processing will be executed only broadcast communication “0” and
with those inverters that match set inverter numbers. Data will not be returned if
“0” (broadcast communication) and inverter numbers do not match.

2) Command (1 byte) : Set the read command (03H fixed).

3) Communication No.. (2 bytes) : Set in the order of high to low numbers.

4) Number of data groups (2 bytes) : Set the number of data words 0001 (fixed) in the order of high to low numbers.

5) CRC (2 bytes) : Set generation results of CRC in the order of low to high numbers.. For the
method to generate CRC, see “5.2 CRC Generation.” Note that the setting se-
quence is reversal to that of others.
◼ Inverter → Computer (Normal return) *The text size is 7 bytes fixed.

Inverter Number of Read data Read data CRC CRC

(3.5bytes Command (3.5bytes
No. Data (high) (low) (low) (high)
Blank) Blank)
03 02
1) Command (1 byte) : Read command (03H fixed) will be returned.
2) Number of data : A number of data bytes (02H fixed) will be returned. The number of data groups for
transmission to the inverters is 2 bytes and 01H fixed. Note that the number of data re-
turned by the inverters is 1 byte and 02H fixed.
3) Read data (2 bytes) : Returned in the order of read data (high) and (low).
◼ Inverter → Computer (Abnormal return) *The text size is 5 bytes fixed.

CRC CRC
(3.5bytes Inverter No. Command Error Code (3.5bytes
(low) (high)
Blank) Blank)
83
1) Command (1 byte) : 83H fixed (Read command error) (Command + 80H)
2) Error code (1 byte) : See “4.3 Transmission errors.”

◼ Example: Reading output frequency (During 60Hz operation)

(Computer → inverter) 01 03 FD 00 00 01 B5 A6
(Inverter → computer) 01 03 02 17 70 B6 50

◼ Example: Data specification error

(Computer → inverter) 01 03 FD 00 00 02 F5 A7
(Inverter → computer) 01 83 03 01 31

30
 E6581315

5.1.2. Write command (06)

◼ Computer → Inverter *The text size is 8 bytes fixed.

Commu- Commu-
Inverter Write Data Write Data CRC CRC
(3.5bytes Command nication nication (3.5bytes
No. (high) (low) (low) (high)
Blank) No. (high) No. (low) Blank)
06

1) Inverter No. (1 byte) : Specify an inverter number between 0 and 247 (00H to F7H).
Command processing will be executed only broadcast communication “0” and with
those inverters that match set inverter numbers. Data will not be returned if “0”
(broadcast communication) and inverter numbers do not match.
2) Command (1 byte) : Set the write command (06H fixed).
3) Communication No. (2 bytes) : Set in the order of high to low numbers.
4) Write data (2 bytes) : Set in the order of high to low write data.
5) CRC (2 bytes) : Set generation results of CRC in the order of low to high numbers. For the method
to generate CRC, see “5.2 CRC Generation.” Note that the setting sequence is re-
versal to that of others.

◼ Inverter → Computer (Normal return) *The text size is 8 bytes fixed.

Commu- Commu-
Inverter Write Data Write Data CRC CRC
(3.5bytes Command nication nication (3.5bytes
No. (high) (low) (low) (high)
Blank) No. (high) No. (low) Blank)
06
1) Command (1 byte) : Write command (06H fixed) will be returned.
2) Write data (2 bytes) : Returned in the order of write data (high) and (low).

◼ Inverter → Computer (Abnormal return) *The text size is 5 bytes fixed.

CRC CRC
(3.5bytes Inverter No. Command Error Code (3.5bytes
(low) (high)
Blank) Blank)
86
1) Command (1 byte) : 86H fixed (Read command error) (Command + 80H)
2) Error code (1 byte) : See “4.3 Transmission errors.”

◼ Example: Writing in frequency command value (FA01) (60Hz)

(Computer → inverter) 01 06 FA 01 17 70 E6 C6
(Inverter → computer) 01 06 FA 01 17 70 E6 C6

◼ Example: Communication number error

(Computer → inverter) 01 06 FF FF 00 00 89 EE
(Inverter → computer) 01 86 02 C3 A1

Note
▼ The EEPROM life is 10,000 operations.
Do not write in the same parameter that has an EEPROM more than 10,000 times.

31
 E6581315

5.2. CRC Generation

“CRC” is a system to check errors in communication frames during data transmission. CRC is
composed of two bytes and has hexadecimal-bit binary values. CRC values are generated by the
transmission side that adds CRC to messages. The receiving side regenerates CRC of received
messages and compares generation results of CRC regeneration with CRC values actually re-
ceived. If values do not match, data will be aborted.

◼ Flow

CRC generation ( ) A procedure for generating a CRC is:

1, Load a 16–bit register with FFFF hex (all 1’s). Call this
the CRC register.
CRC initial data: FFFF

Byte counter n = 0 2. Exclusive OR the first 8–bit byte of the message with
the low–order byte of the 16–bit CRC register, putting
Nｏ the result in the CRC register.
Byte counter n < Length

Yes 3. Shift the CRC register one bit to the right (toward the
CRC = (CRC XOR nth send byte LSB), zero–filling the MSB. Extract and examine the
(0 expanded to word (higher 8
bits)) LSB.

Bit counter = 0 4. (If the LSB was 0): Repeat Step 3 (another shift).
(If the LSB was 1): Exclusive OR the CRC register with
Nｏ the polynomial value A001 hex (1010 0000 0000 0001).
Bit counter < 8
Yes 5. Repeat Steps 3 and 4 until 8 shifts have been per-
C = (Remainder of CRC ÷ 2) formed. When this is done, a complete 8–bit byte will
have been processed.
ＣＲＣ >> １

Is remainder (C) Nｏ 6. Repeat Steps 2 through 5 for the next 8–bit byte of the
other than 0? message. Continue doing this until all bytes have been
Yes processed.
CRC＝
(CRC XOR generating polyno-
mial (A001)) 7. The final contents of the CRC register is the CRC val-
ue.
Bit counter +1
8. When the CRC is placed into the message, its upper
and lower bytes must be swapped as described below.
Byte counter +1

End (Return CRC)

5.3. Error codes

In case of the following errors, the return commands from the inverters are added 80h to the com-
mands received by the inverters. The following error codes are used.

Error Code Description

01 Command error (Returned when a command other than 03 or 06 is received)
Communication number error (A communication number is not found when
02
Command 03 or 06 is received)
03 Data range error (Data range error when Command 03 or 06 is received
Unable to execute (Command 06 is being received and data cannot be written)
04 (1) Writing in write-disable-during-operation parameter
(2) Writing in parameter that is executing TYP

32
 E6581315

6. Inter-drive communication
Inter-drive communication (communication between inverters) are used, for example, when per-
forming speed proportional control or load sharing torque control of two or more inverters without
using a PLC or computer. The command is instructed by the operation from the master inverter’s
panel or analog input, etc.
With the Inter-drive communication function, the master inverter continues to transmit the data se-
lected by the parameters to all the slave inverters on the same network. The master inverter uses
the S command for outputting instructions to the slave inverters, and the slave inverters do not re-
turn the data. (See chapter 4.2 "Command".) Network construction for a simple synchronized op-
eration and speed-proportional operation can be created by this function.
* If the master inverter trips, the slave inverters display the blinking error code “t” and come to a
full stop (0Hz).
Restoring the master inverter that has tripped returns the slave inverters to working order.
* With the communication time-out parameters f803 and f804, you can specify what the
slave inverters should do (continue to operate, issue an alarm or trip) if a cable is broken or the
master inverter is turned off during operation.
* Should use 4-wire RS485 communication.
* To use the inter-drive communication function, select “TOSHIBA Inverter Protocol” (,
=) in the communication protocol selection parameters. “TOSHIBA Inverter Protocol”
(, =) is set for communication protocol selection in Shipment setting. (See “3.
Communication protocol.”)

<Conceptual illustration (4-wire RS485 communication)>

Master (60Hz) Slave 1 (50Hz) Slave 2 (40Hz) Slave 3 (30Hz)

VF-AS1 VF-AS1 VF-AS1 VF-AS1

Analog input

<Notes>
Speed command can be transmitted but the run / stop signal is not issued. Slave station should have an indi-
vidual stop signal or the function to stop the action by the frequency reference. (Setting is necessary for
: Operation start frequency, : Operation start frequency hysteresis .)
For continuing the operation by the last received command value in the case of a communication breakdown,
communications time-out time () to trip the slave inverters. The master inverter does not trip even
though the communication breakdown happens. To trip the master inverter, provide an interlock mechanism by
installing an FL fault relay point or the like from the slave side.

33
 E6581315

◼Wiring (4-wire RS485 communication)

Cross Straight Straight

Master Slave Slave Slave

CN1
Pin-4 RXA RXA RXA RXA

Pin-5 RXB RXB RXB RXB

Pin-3 TXA TXA TXA TXA

Pin-6 TXB TXB TXB TXB

Pin-8 SG SG SG SG
(Pin-2)
Terminating resistance
120Ω-1/2W

* Never use pin-1 (Open) and pin-7 (P11).

* You do not need to connect the master receive lines (pins 4 and 5) or the slave send lines (pins 3
and 6).

34
 E6581315

◼ Setting of parameter

●Protocol selection (, ) Shipment setting: 0 (TOSHIBA)

Protocol setting with all inverters (both master and slave inverters) engaged in inter-drive com-
munication
0: Set the TOSHIBA.
* Inter-drive communication are disabled when the MODBUS-RTU protocol is selected.
* This parameter is validated after resetting the inverter or rebooting the power supply.

● Setting of master and slave inverters for communication between inverters (setting of master and
slave) (, ) ... Shipment setting = 
Assign one master inverter in the network. Other inverters should be the slave inverters.
*Specify only one inverter as the master. In case two or more inverters are designated for the
master inverter in the same network, data will collide.

- Setting to the master inverter

Set data desired for sending from the master side to the slave side.
: Master (sends a frequency command)
: Master (sends an output frequency)
: Master (sends a torque command)
: Master (sends an output torque command)

- Setting to the slave inverters

Set the desired action on the slave side that will be needed when the master trips.
0: Slave (issues a 0Hz command if something goes wrong with the master) (when f806 and
f826 are set to 3 and 4, respectively.))
(The output frequency is limited to the lower limit frequency.)
1: Slave (continues operation if something goes wrong with the master)
Note: If the master inverter trips when an output frequency is specified for it, the operation fre-
quency of the slave inverters become 0Hz because tripping of the master inverter causes its
output frequency to drop to 0Hz.
2: Slave (trips for emergency stop if something goes wrong with the master)
The way they make an emergency stop depends on the setting of f603 (emergency stop).

*This parameter is validated after resetting the inverter or rebooting the power supply.

• Send waiting time (, f825) ... Shipment setting = 

- Setting to the master inverter
Specify a waiting time if you want the master to issue commands to slaves with a given delay.
When communication baud rate is 9600bps (, f820=), this value needs more than
 sec.

● Frequency setting mode selection 1 (fm0d) ･･･ Shipment setting = 2: RR/S4 input
Designate a target of speed command input for the inverter to the parameter .

- Setting to the master inverter

Select an option other than RS485 communication (fm0d≠5 or 6).

- Setting to the slave inverters

Select from between:
fm0d=5: 2-wire RS485 communication input
fm0d=6: 4-wire RS485 communication input

35
 E6581315

◼ Relating communication parameters

Following parameters should be set or changed if necessary.

• Baud rate (, )... Shipment setting = : 19200bps

Baud rate of all inverters in the network (master and slave) should be same network.

• Parity (, ) ... Shipment setting = : Even parity

Parity of all inverters in the network (master and slave) should be same network.

• Communication time-out time() ... Shipment setting = 

Operation is continued by the last received command value in the case of a communication
breakdown. To stop the operation of inverter, provide a communication time-out time (ex.
= second) to the slave inverters. The master inverter does not trip even though the com-
munication breakdown happens. To trip the master inverter, provide an interlock mechanism by in-
stalling a FL fault relay point or the like from the slave side.

• Frequency point selection (, )

Adjusted to the system.
See chapter “6.1 Speed proportional control” for details.

◼ Setting example of parameters (2-wire RS485 communication)

Parameters relating to the master side (example) Parameters relating to the slave side (example)
 Master (transmission of output frequency  Slave (If the master inverter trips, all slave inverters stop
(%) (100% at FH)) operating.)
 Selection of communication protocol  Selection of communication protocol
(Toshiba inverter protocol) (Toshiba inverter protocol)
 Communication baud rate Note)  Communication time-out (ex. 1 second)
(ex. 19200bps)  Communication baud rate (same to the master side)
 Parity (even parity)  Parity (same to the master side)
 Example: Panel  Terminal block (ex. Driven by F, ST)
 Example: RR/S4 input ( Run and stop of operation is controlled with the frequency
reference value by setting the “run frequency”.)
<During torque control>  Operation panel RS485 (2-wire) communication input
 Master (sends a torque command)  2-wire RS485
? Adjusted to the system Point 1 setting (%)
Note)  ? Ditto Point 2 frequency (Hz)
< Communication baud rate is 9600bps >  ? Ditto Point 2 setting (%)
 Send waiting time  ? Ditto Point 2 frequency (Hz)

<During torque control>

 RS485 communication input
 Load sharing gain input mode selection (ex. Operation
panel input enabled)
Panel load sharing gain (ex. Sharing of half of the com-
mand value)

36
 E6581315

6.1. Proportional control of speed

Proportional control of frequency can be performed in two ways: control by selecting frequency
points and control by adjusting the ratio to the maximum frequency. This section explains propor-
tional control of inverters by means of a master inverter (inter-drive communication), although the
AS1 series inverters are ready for proportional control by means of the “S” command even when
they are operated under the control of a computer (computer-linked communication) (in the latter
cases, read the master inverter as the computer).
Proportional control can also be performed in units of Hz using ordinary write commands (W and P
commands) (frequency point selection only). For proportional control in units of %, however, the S
command should be used.
* For proportional control by selecting frequency points, the gradient can be set variously according
to the way each inverter is used. For proportional control by controlling the ratio to the maximum
frequency, settings can be made easily without consideration of the rate at which the frequency is
increased or decreased to the target frequency.

• Data sent by the master inverter to slave inverters in inter-drive communication mode (frequency
command value)

Master side fc×10000

fc(% ＝
) (1=0.01%)
Master side FH
* Fractions under 1 (0.01%) are omitted. Therefore, an error of 0.01% is introduced at the maxi-
mum.

• Conversion of the frequency command received by a slave inverter (when the “frequency point
selection” option is not selected)
The value obtained by the following conversion calculation is written in RAM as a frequency com-
mand value.

Slave receive data(% ) Slave side FH

fc( Hz ) = (1=0.01Hz)
10000
* Fractions under 1 (0.01Hz) are omitted. Therefore, an error of 0.01Hz is introduced at the maxi-
mum.

[Diagram of speed proportional control]

<Outside> ← →<Inverter's internal computation>

* fc=frequency reference, FH=maximum frequency
?
Operation performed by the Operation performed by the slave
Point selection ()
master (or use of S command)
Fc (Hz)
Master fc % Slave receive data Hz Points not selected
Master send data＝  10000 Data ( Hz )＝  Slave FH
Master FH 10000

Point conversion
% Points selected
(Hz)
Setting 2 fc ()
Slave command
Setting 1 fc ()

Point1 Point2 (%)

() ()
Master command
Point 2fc − Po int 1fc Hz
Slave command＝  ( Master command－Point1）＋Point 1fc
Point2 − Point1

Hz fc
Data＝  10000 %
Slave FH

• If the “Frequency point selection” function is disabled (=)

The operation frequency (frequency command value) of the inverters are calculated using the fol-

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 E6581315
lowing equations, with the received data in the following equation used as the data received from
the master inverter when inverters are operated under the control of a master inverter (inter-drive
communication), or with the received data in the following equation used as the data received from
the computer when inverters are operated under the control of a computer (computer-linked opera-
tion).

Slave recieve data(% ) Slave side FH

fc( Hz ) = (Hz)
10000
Example: Unit:1=0.01Hz
Maximum frequency Operation frequency command value
Master (Fc) 100.00Hz (10000) 50.00Hz (5000)
Slave 1 90.00Hz (9000) 45.00Hz (4500)
Slave 2 80.00Hz (8000) 40.00Hz (4000)
Master side fc  10000 5000×10000
Master send data：fc(% )= = = 5000 = 50%
Master side FH 10000
5000  9000
Slave 1 : fc( Hz ) = = 4500 = 45Hz
10000
5000  8000
Slave 2 : fc( Hz ) = = 4000 = 40 Hz
10000

• If the “Frequency point selection” function is enabled (≠)

When inverters are operated under the control of a mater inverter, the operation frequency (fre-
quency command value) of the slave inverters are calculated using the following equations.
When inverters are operated under the control of a computer, read “command from the master in-
verter” in the following equations as “command from the computer.”

Po int 2 frequency − Po int 1 frequency

fc( Hz ) = （Master command (% )− Po int 1）＋Po int 1 frequency
Po int 2 − Po int 1
(Hz)
Example: Units: Frequency unit 1 = 0.01Hz, Point setting unit 1 = 0.01%
Maximum Point 1 set- Point 1 fre- Point 2 set- Point 2 fre- Frequency
frequency ting quency ting quency (Fc)
() () () () ()
Master (Fc) 100.00Hz － － － － 50.00Hz
(10000) (5000)
Slave 1 100.00Hz 0.00% 0.00Hz 100.00% 90.00Hz 45.00Hz
(10000) (0) (0) (10000) (9000) (4500)
Slave 2 100.00Hz(1 0.00% 0.0Hz 100.00%(10 80.00Hz 40.00Hz
0000) (0) (0) 000) (8000) (4000)
Data sent by the master inverter
Master side fc  10000 5000×10000
Master send data : fc(% )= = = 5000 = 50%
Master side FH 10000
Both slaves 1 and 2: Result of a conversion made on the slave side
Slave receive data(%)  Slave side FH 5000  10000
fc( Hz ) = = = 5000 = 50Hz
10000 10000
Both slaves 1 and 2: Result of a conversion to % made prior to a conversion to point frequency
fc( Hz )  10000 5000  10000
fc(% )= = = 5000 = 50%
Slave side FH 10000
Results of conversions to point frequency (for the equation used, see above.)
9000 − 0
Slave 1 : fc( Hz ) =  ( 5000 − 0 )＋0 = 4500 = 45Hz
10000 − 0
8000 − 0
Slave 2 : fc( Hz ) =  ( 5000 − 0 )＋0 = 4000 = 40Hz
10000 − 0

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 E6581315

6.2. Transmission format for inter-drive communication

Data type is handled in hexadecimal notation and the transmission characters are treated with the
binary (HEX) code.
The transmission format is basically the same to the case of binary mode. S command is used and
the slave inverters do not return the data.

◼ Master inverter → Slave inverter (Binary mode)

Omissible

(3.5bytes “/” INV-NO CMD Communication No. DATA SUM (3.5bytes

Blank) (2FH) 1 byte 1 byte 2 bytes 2 bytes 1 byte Blank)

Checksum area Not omissible

1) INV-NO (1 byte) : Inverter number

This is always excluded at the master inverter side at time of inter-drive communication,
and can be added when the user utilize this data for the purpose of proportional operation.
(When this code is added, only the inverter concerned will accept the data.)
2) CMD (1 byte) : Command
53H(“S”) or 73(“s”) command ... command for inter-drive communication
When the master inverter is not tripping, this will be 53H(“S”).
When the master inverter is tripping, this will be 73H(“s”).
3) Communication number (2 bytes) :
Specify “FA01” for two-wire RS485 communication.
Specify “FA05” for four-wire RS485 communication.
4) DATA (2 bytes) : Data of frequency command value.
(0000H to FFFFH (no range check))

As for the S command, see section 4.2 “Commands”, and see chapter “6 Inter-drive communication function” for the
communication of inverters.

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 E6581315

7. Communication parameters
The settings of communication-related parameters can be changed from the operation panel and
the external controller (computer). Note that there are two types of parameters: parameters whose
settings take effect immediately after the setting and parameters whose settings do not take effect
until the inverter is turned back on or reset.

Com-
munica- Default
Title Function Adjustment range Unit Valid Reference
tion setting
Number.
0: 9600bps
Baud rate
0800  (2-wire RS485) 1: 19200bps - 1 After reset. Section 7.1
2: 38400bps
0: Non parity
Parity Section 7.1
0801  (2-wire RS485) 1: Even parity - 1 After reset.
Note)
2: Odd parity
Inverter number
0802  0-247 1 0 Real time Section 7.2
(common)
Communication
0:OFF
0803  time-out time 1-100s
1s 0 Real time Section 7.3
(common)
2-wire 4-wire
0 - -
1 t alarm -
2 Err5 trip -
Communication
3 - t alarm
0804 time-out action 1 8 Real time Section 7.3
4 t alarm t alarm
(common)
5 Err5 trip t alarm
6 - Err5 trip
7 t alarm Err5 trip
8 Err5 trip Err5 trip
Send waiting time 0.00: Default
0805  0.01s 0.00 Real time Section 7.4
(2-wire RS485) 0.01-2.00s
0:Slave (issues a 0Hz command if some-
thing goes wrong with the master)
1:Slave (continues operation if something
goes wrong with the master)
Inverter-to-inverter 2:Slave (trips for emergency stop if
0806  communication something goes wrong with the master) - 0 After reset. Chapter 6
(2-wire RS485) 3:Master (sends a frequency command)
4:Master (sends an output frequency)
5.Master (sends a torque command)
6.Master (sends an output torque com-
mand)
Protocol selection 0: TOSHIBA
0807  - 0 After reset. Chapter 3
(2-wire RS485) 1:MODBUS-RTU
0: Always detect
Communication
0808 f808 time-out detection 1: during communication - 0 Real time Section7.3
2:1+running
0:Disabled
Frequency point 1:2-wire RS485
0810  - 0 Real time Section 6.1
selection 2:4-wire RS485
3:Communication add option
0811  Point 1 setting 0-100% - 0 Real time
0812  Point 1 frequency 0-Hz 0.01Hz 0.0 Real time
Section 6.1
0813  Point 2 setting 0-100% - 100 Real time
0814  Point 2 frequency 0-Hz 0.01Hz 60.0 Real time
Communication 0: 9600bps
0820 speed 1: 19200bps - 1 After reset. Section 7.1
(4-wire RS485) 2: 38400bps
Send waiting time 0.00: Normal
0825  0.01s 0.00 Real time Section 7.4
(4-wire RS485) 0.01-2.00s

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 E6581315

Com-
munica- Default
Title Function Adjustment range Unit Valid Reference
tion setting
Number.
0:Slave (issues a 0Hz command if some-
thing goes wrong with the master)
1:Slave (continues operation if something
goes wrong with the master)
Inverter-to-inverter
2:Slave (trips for emergency stop if
communication
0826  something goes wrong with the master) - 0 After reset. Chapter 6
setting (4-wire
3:Master (sends a frequency command)
RS485)
4:Master (sends an output frequency)
5.Master (sends a torque command)
6.Master (sends an output torque com-
mand)
0: Non parity
Parity Section 7.1
0827  1: Even parity - 1 After reset.
(4-wire RS485) Note)
2: Odd parity
Protocol selection 0: TOSHIBA
0829  - 0 After reset. Chapter 3
(4-wire RS485) 1: MODBUS-RTU
mortor pole-number
0856 f856 1:2pole, 2:4pole, - 8:16pole - 2 Real time Section8.1
(common)
0870  Block write data 1 0: Deselect
1: Command information 1 (FA00)
2: Command information 2 (FA20)
3: Frequency command (FA01)
Section
4: Terminal board output data - 0 After reset.
0871  Block write data 2 4.1.3
(FA50)
5: Communication analog data
(FA51)
6: Motor speed command (FA13)
0875  Block read data 1 0: Deselect
1: Status information (FD01)
0876  Block read data 2 2: Output frequency (FD00)
3: Output current (FD03)
0877  Block read data 3 4: Output voltage (FD05)
0878  Block read data 4 5: Alarm information 1 (FC91)
6: PID feedback value (FD22)
7: Input terminal board monitor (FD06)
8: Output terminal board monitor (FD07)
9: VI/IIterminal board monitor (FE36)
Section
10: RR/S4 terminal board monitor (FE35) - 0 After reset.
4.1.3
11:RX terminal board monitor (FE37)
12:Input voltage (DC detection) (FD04)
0879  Block read data 5 13:Speed feedback frequency (FD16)
14:Torque (FD18)
15:MY monitor 1 (FE60)
16:MY monitor 2 (FE61)
17:MY monitor 3 (FE62)
18:MY monitor 4 (FE63)
19:Free notes (F880)
20:Output motor speed monitor (FE90)
0880  Free notes 0-65535 1 0 Real time Section 7.5
Note) f827 exists after CPU1 Ver.154. See “7.1 Baud rate(, ) , Parity (, f827)”.

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 E6581315

7.1. Baud rate(, ) , Parity (, f827)

•Communication baud rate and parity bit should be uniform inside the same network.
•This parameter is validated by resetting the power supply.
•The parity of 4-wire can be set by F827 after Ver.154 (CPU version 1).

Type Function Before Ver.153 After Ver154

Baud rate f800 Same as left

2-wire
Parity f801 Same as left
Baud rate f820 Same as left
4-wire
Parity f801 f827

7.2. Inverter number()

This parameter sets individual numbers with the inverters.
Inverter numbers should not be duplicate inside the same network.
Receiving data will be canceled if inverter numbers specified in individual communication and set
by a parameter do not match.
This parameter is validated from the communication after change

Data range: 0 to 247 (Initial value: 0)

Parameters can be selected between 0 and 247. Note that the communication protocols limit
inverter numbers as follows:
● TOSHIBA Inverter Protocol ASCII mode: 0 to 99
● TOSHIBA Inverter Protocol Binary mode: 0 to 63
● MODBUS Protocol: 0 to 247 (0: Broadcast communication)

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 E6581315

7.3. Communication time-out detection (f803) (f804) (f808)

The timer function is mainly used to detect a break in a cable during communication, and if no data
is sent to an inverter within the preset time, this function makes the inverter trip () or issue
an alarm (). With the communication time-out action parameter (), you can specify what
the inverter should do (trip, issue an alarm or do nothing) if a time-out occurs.

◼ How to set the timer

By default, the communication time-out time parameter () is set to  (OFF).
* Timer adjustment range
About 1 sec. (01H) to about 100 sec. (64H) / Timer off (0H)

◼ How to specify what an inverter should do if a time-out occurs

By default, the communication time-out action parameter () is set to  ( trip) for
both 2-wire and 4-wire RS485 communication.
* Selection of time-out action (Range: 0 to 8 ... For details refer to “6. Communication parame-
ters.)
The action of the inverter at the occurrence of a time-out can be selected from among “do noth-
ing,” “trip ()” and “alarm ()” individually for two-wire and four-wire RS485 communica-
tion.

◼ Time-out detection
By default, the communication Time-out detection (f808) is set to 0 ( Always detect ).
When it is set to 1, It detect time-out error during communication.
When it is set to 2, It detect time-out error during communication and running.

◼ How to start the timer

If the timer is set from the operation panel, it will start automatically the instant when communica-
tion is established for the first time after the setting.
If the timer is set from the computer, it will start automatically the instant when communication is
established after the setting.
If the timer setting is stored in the EEPROM, the timer will start when communication is established
for the first time after the power has been turned on.
Note that, if the inverter number does not match or if a format error occurs, preventing the inverter
from returning data, the timer function will assume that no communication has taken place and will
not start.

◼ How to disable the timer

To disable the timer, set its parameter to 0.
Ex.: To disable the timer function from the computer (To store the timer setting in the EEPROM)
Computer → Inverter Inverter → Computer
(W08030)CR (W08030000)CR ... Sets the timer parameter to 0 to disable it.

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 E6581315

◼ Timer

Time-out period

Computer link PC → INV PC → INV The timer measures the time

elapsed before the inverter
INV → PC
acknowledges receipt of data after
it acknowledged receipt of the pre-
Inter-drive Master INV Master INV vious data.
to Slave to Slave
communication INV INV

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 E6581315

7.4. Send waiting time (, )

Use this function for the following case:
When the data response from the inverter is too quick after the PC had sent the data to the inverter,
PC process cannot get ready to receive the data, or when the USB/RS485, RS485/RS232C con-
verter is used, changeover of sending and receiving data takes much time in the converter pro-
cess.

Functional specification:
A time for sending data is prolonged longer than the preset time (, ), until the in-
verter returns the data to the PC, after it finishes receiving the data (in case of an inter-drive com-
munication, until the inverter returns the next data to the PC, after it has sent the data.) In case the
inverter's processing capacity requires longer setting time, the value more than this time will be the
set value. (The parameter makes the inverter wait for more than the set time.)

Setting range:  to seconds (10ms to 2000ms)

If the set value is , this function becomes invalid and the interval time for sending data is set to
the maximum capacity of the inverter. To obtain a quick response for sending data, set value .

Time elapses more than

Computer link PC→INV transmission waiting time.

INV→PC
Inter-drive Master INV
communication to Slave INV
Master INV to
Time elapses more than the Slave INV
transmission waiting time.

7.5. Free notes()

This parameter allows you to write any data, e.g., the serial number of each inverter or parameter
information, which does not affect the operation of the inverter.

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 E6581315

8. Commands and monitoring from the computer

Across the network, instructions (commands and frequency) can be sent to each inverter and the
operating status of each inverter can be monitored.

8.1. Communication commands (commands from the computer)

◼ Communication command (Communication number: FA00, FA04)
Commands can be executed on inverter frequencies and operation stop through communication.
The VF-AS1 series can enable command and frequency settings through communication irrespec-
tive of settings of the command mode selection () and frequency setting mode selection 1
(). However, if “48 (49): Forced switching from communication to local,” “56 (57): Forced
continuous operation,” or “58 (59): Specified speed operationj” is set by input terminal function se-
lection ( to ), a change to a command other than communication and to a frequen-
cy command is feasible through a contact on the terminal board.
Once the communication command (FA00, FA04) is set to enable communication command prior-
ity and frequency priority, both priorities will be enabled unless OFF is set, power is turned off or is
reset, or factory default setting () is selected. Emergency stop is always enabled even
though communication command priority is not set.
Table 1 Data construction of communication commands (communication number: FA00, FA04)
bit Specifications 0 1 Remarks
0 Preset speed operation Preset speed operation is disabled or preset
frequencies 1 speed operation frequencies (1-15) are set by
1 Preset speed operation specifying bits for preset speed operation fre-
frequencies 2 quencies 1-4.
2 Preset speed operation (0000: Preset speed operation OFF,
frequencies 3 001-1111: Setting of preset speed operation
3 Preset speed operation frequencies (1-15))
frequencies 4
4 Motor selection (1 or 2) Motor 1 Motor2 THR1 : 
(THR 2 selection) (THR 1) (THR2) THR2 : 
5 PID control OFF PID control permitted PID control prohibited
6 Acceleration/deceleration Accelera- Accelera- AD1 : , 
pattern selection (1 or 2) tion/deceleration pattern tion/deceleration pattern AD2 : , 
(AD2 selection) 1 (AD1) 2 (AD2)
7 DC braking OFF Forced DC braking
8 Jog run OFF Jog run
9 Forward/reverse run se- Forward run Reverse run
lection
10 Run/stop Stop Run
11 Coast stop command Standby Coast stop
12 Emergency stop OFF Emergency stop Always enabled, “E” trip
13 Fault reset OFF Reset No data is returned from the invert-
er.
14 Frequency priority selec- OFF Enabled Enabled regardless of the set-
tion ting of 
15 Command priority selec- OFF Enabled Enabled regardless of the set-
tion ting of 
Note: The acceleration/deceleration change command OR with Bit 8 and 9 of Communication
number FA20 and FA22.
Ex.: Forward run command used in two-wire RS485 communication (PFA008400) CR
1 is specified for bit 15 (communication command: enabled) and bit 10 (operation command).
BIT15 BIT0
FA00: 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0
8 4 0 0

Ex.: Reverse run command used in two-wire RS485 communication (PFA008600) CR, (PFA00C600) CR
8600H : To disable frequency instructions from the computer
C600H : To enable also frequency instructions from the computer

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 E6581315

◼ Communication command2 (Communication Number : FA20, FA22)

This command is enabled only when the communication command is enabled. Set Bit 15 of
Communication Command 1 (communication Number: FA00, FA04) to “1” (enable). When ena-
bling the communication command by Communication Command 1, commands by communication
can be given the priority irrespective of the setting of the command mode selection parameter
(). However, if “48 (49): Forced switching from communication to local,” “56 (57): Forced
continuous operation,” or “58 (59): Specified speed operationj” is set by input terminal function se-
lection ( to ), the enabled command and frequency will be given the priority.

Once enabled, this setting will be enabled till disable is set (0 setting), power is turned off or is re-
set, or factory default setting () is selected.

Table 2 Data construction of communication command 2 (FA20, FA22)

Bit Function 0 1 Remarks
0 Control switching Speed control Torque control
electric power quantity Electric power quantity
1 ＯＦＦ Reset
reset (FE76, FE77) reset
2 (Reserved) － －
3 Braking request (BC) Normal Forcibly braked
4 Preliminary excitation Normal Enabled
5 Brake release (B) Brake applied Brake released
6 Braking answer (BA) Brake applied Brake released
Maximum deceleration
7 Normal Enabled
forced stop
Acceleration/deceleration Select Acceleration/ de-
8
pattern selection 1 celeration 1 - 4 by com-
00: Acceleration/deceleration 1
bination of two bits
01: Acceleration/deceleration 2
AD1: , 
Acceleration/deceleration 10: Acceleration/deceleration 3
9 AD2: , 
pattern selection 2 11: Acceleration/deceleration 4
AD3: , 
AD4: , 
00: V/F 1
10 V/Fswitching 1
01: V/F 2 Select V/F 1 - 4 by com-
10: V/F 3 bination of two bits
11 V/Fswitching 2
11: V/F 4
00: Torque limit 1
12 Torque limit switching 1
01: Torque limit 2 Select torque limit 1 - 4 by
10: Torque limit 3 combination of two bits
13 Torque limit switching 2
11: Torque limit 4
Gain 1: , 
14 Speed gain 1/2 Gain 1 Gain 2
Gain 2: , 
15 (Reserved) － －
Note: Set 0 to reserved bit.
Note: The acceleration/deceleration change command ORs with Bit 6 of Communication number
FA00 and FA04.
Set Bit 6 of FA00 and FA04 to “0” and use FA20 and FA22 when changing accelera-
tion/deceleration in four types. Acceleration/deceleration 4 will be set when both Bit 8 of Commu-
nication number FA20 and FA22 (or Bit 6 of Communication number FA00 and FA04) and Bit 9 of
Communication number FA20 and FA22 are set.

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 E6581315

◼ Frequency setting from the computer “Communication Number: FA01, FA05”

Setting range: 0 to maximum frequency (fh)
This frequency command is enabled only when the frequency command by communication is ena-
bled. To make frequency commands from the computer valid, set the frequency setting mode se-
lection parameter (fmod) to RS485 communication (communication No. 0004: 5 (2-wire RS485
communication input) or 6 (4-wire RS485 communication input) or select the “Command priority”
option (bit 14 of FA00 and FA04: 1 (enabled)). In this case, frequency commands by communica-
tion will be enabled independent of fmod setting.
However, enabled commands and frequencies are given the priority if “48 (49): Forced switching
from communication to local,” “56 (57): Forced continuous operation,” or “58 (59): Specified speed
operation” is set by input terminal function selection (f11o to f118).
Once enabled, this frequency setting will be enabled till disable is set (0 setting), power is turned
off or is reset, or factory default setting (typ) is selected.

Set a frequency by communication hexadecimal in Communication Number FA01, FA05.

(1=0.01Hz (unit))

Example: Operation frequency 80Hz command by 2-wire RS485 communication (PFA011F40) CR

80Hz=80÷0.01=8000=1F40H

◼ Motor speed command setting from the computer (communication number: FA13)
Setting range: 0 to 24000min-1

The number of motor poles is selected by to f856.

The motor speed command can be set from FA13.
The output frequency is converted from the motor speed command by the following calculation
formula.
If the output frequency is more than fh, Inverter return the error to the computer and the motor
speed command is ignored.

Output frequency [0.01Hz] = (Output motor speed [min -1] x poles [f856] ) ÷ 120

This frequency command is enabled only when the frequency command by communication is ena-
bled. To make frequency commands from the computer valid, set the frequency setting mode se-
lection parameter (fmod) to 6 (4-wire RS485 communication input) or select the “Command pri-
ority” option (bit 14 FA04: 1 (enabled)). In this case, frequency commands by communication will
be enabled independent of fmod setting.
However, enabled commands and frequencies are given the priority if “48 (49): Forced switching
from communication to local,” “56 (57): Forced continuous operation,” or “58 (59): Specified speed
operation” is set by input terminal function selection (f11o to f118).
Once enabled, this frequency setting will be enabled till disable is set (0 setting), power is turned
off or is reset, or factory default setting (typ) is selected.

Set a speed by communication hexadecimal in Communication Number FA13. (1 = 1min -1 (unit))

Example: f856=2: 4pole , Speed command is 1800min-1 (PFA130708) CR

60.00 Hz = (1800 min-1 x 4 poles ) ÷ 120

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 E6581315

◼ Torque command setting from the computer “2-wire RS485 communication: FA30,
4-wire RS485 communication: FA32
This section explains how to set a torque command value for inverters. The torque command value
set here takes effect if torque commands from the computer are valid when the inverters are in
torque control mode (in cases where torque control is selected with the terminal board or with a
communication command when ( is set to 4 or 8).
To make torque commands from the computer valid, set the torque command selection parameter
 (communication No. 0420) to 5 (2-wire RS485 communication input) or 6 (4-wire RS485
communication input). Once torque commands from the computer have been set, they remain val-
id until they are changed, the inverters is turned off or reset, or the parameter  for returning
settings to their defaults is selected. (The settings of FA30 and FA32 are not stored in EEPROM.
Therefore, they are cleared when the inverter is turned off or reset.)

When setting a torque for torque commands from the computer, specify a torque in hexadecimal
(unit: 1=0.01%, two-wire RS485 communication: FA30 or four-wire RS485 communication: FA32).

Example: 50% torque command (PFA321388)

50%=50÷0.01=5000=1388H

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 E6581315

◼ Terminal board output data (FA50)

The output terminal board on each inverter can be directly controlled with the computer.
To use this function, select functions 92 to 105 in advance for the output terminal function selection
parameters f130 to f138, f168andf169. If bit 0 through bit 6 of terminal board
output data (FA50) are set with the computer, data specified (0 or 1) can be sent to any output
terminal.

Data composition of terminal board output data (FA50)

Bit Output terminal function 0 1
0 Specified data output 1 OFF ON
(Output terminal no.: 92, 93)
1 Specified data output 2 OFF ON
(Output terminal no.: 94, 95)
2 Specified data output 3 OFF ON
(Output terminal no.: 96, 97)
3 Specified data output 4 OFF ON
(Output terminal no.: 98, 99)
4 Specified data output 5 OFF ON
(Output terminal no.: 100, 101)
5 Specified data output 6 OFF ON
(Output terminal no.: 102, 103)
6 Specified data output 7 OFF ON
(Output terminal no.: 104, 105)
7 to 15 (Reserved) － －
Note: Set 0 to reserved bit.

Example of use: To control only the OUT1 terminal with the computer
To turn on the OUT1 terminal, set the output terminal function selection 1 parameter
(f130) to 92 (output terminal function selection 1 (positive logic)) and specify 0001H for
FA50.

BIT15 BIT0
FA50: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
0 0 0 1

◼ FM analog output (FA51)

The FM analog terminal on each inverter can be directly controlled with the computer.
To use this function, set the FM terminal meter selection parameter (fmsl) to 31 (communica-
tion data output).
This makes it possible to send out the data specified as FM analog output data (FA51) through the
FM analog output terminal. Data can be adjusted in a range of 0 to 2047 (resolution of 11 bits).
For details, refer to “Meter setting and adjustment” of the instruction manual included with the in-
verter.

◼ AM analog output (FA52)

The AM analog terminal on each inverter can be directly controlled with the computer.
To use this function, set the AM terminal meter selection parameter (amsl) to 31 (communica-
tion data output).
This makes it possible to send out the data specified as AM analog output data (FA52) through the
AM analog output terminal. Data can be adjusted in a range of 0 to 2047 (resolution of 11 bits).
For details, refer to “Meter setting and adjustment” of the instruction manual included with the in-
verter.

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 E6581315

8.2. Monitoring from the computer

This section explains how to monitor the operating status of the inverter from the computer.

◼ Monitoring of the output frequency from the computer (FD00, FE00)

Output frequency (current status): “Communication Number FD00” (minimum unit: 0.01Hz)
Output frequency (status immediately before the occurrence of a trip): “Communication Number
FE00” (minimum unit: 0.01Hz)

The current output frequency is read out in hexadecimal in units of 0.01Hz. For example, if the
output frequency is 80Hz, 1F40H (hexadecimal number) is read out. Since the minimum unit is
0.01Hz, 1F40H (hexadecimal number) = 8000 (decimal number) x 0.01 = 80 (Hz)

Example: Monitoring of the output frequency (operation frequency: 50Hz) ・・・ (1F40H=8000d,
8000×0.1=80Hz)
Computer→Inverter Inverter→Computer
(RFD00)CR (RFD001F40)CR

The following items are also calculated in the same way.

• FD22 (PID feedback value) .................................Unit: 0.01Hz
• FD16 (speed feedback) ......................................Unit: 0.01Hz
• FD29 (input power) .............................................Unit: 0.01kW
• FD30 (output power) ...........................................Unit: 0.01kW

◼ Monitoring of the output current with the computer (FD03, FE03)

Output current (current status): “Communication Number FD03” (minimum unit: 0.01Hz)
Output current (status immediately before the occurrence of a trip): “Communication Number
FE03” (minimum unit: 0.01Hz)

The current output current is read out in hexadecimal in units of 0.01%. For example, if the output
current of an inverter with a current rating of 4.8A is 2.4A (50%), 1388H (hexadecimal number) is
read out. Since the minimum unit is 0.01%, 1388H (hexadecimal number) = 5000 (decimal num-
ber) x 0.01 = 50 (%)

Example: Monitoring of the output current (output current: 90%) ・ ・ ・ (2328H=9000d,

9000×0.01=90%)
Computer→Inverter Inverter→Computer
(FRD03)CR (RFD032328)CR

The following items are also calculated in the same way.

• FD05 (output voltage) .........................................Unit: 0.01% (V)
• FD04 (DC voltage) ..............................................Unit: 0.01% (V)
• FD18 (torque) ......................................................Unit: 0.01% (N·m) *
* If data on the motor connected to the inverter is entered with parameters f405 to f415,
100% of the monitored torque closely agrees with the rated torque of the motor.

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 E6581315

◼ Input terminal board status (FD06, FE06)

Input terminal board status (current status): “Communication Number FD06”
Input terminal board status (status immediately before the occurrence of a trip): “Communication
Number FE06”
Using terminal function selection parameters, functions can be assigned individually to the termi-
nals on the input terminal board.
If a terminal function selection parameter is set to 0 (no function assigned), turning on or off the
corresponding terminal does not affect the operation of the inverter, so that you can use the termi-
nal as you choose.
When using a terminal as a monitoring terminal, check beforehand the function assigned to each
terminal.

Data composition of input terminal board status (FD06, FE06)

Bit Terminal name Function (parameter title) 0 1
0 F Input terminal function selection 1 (f111)
1 R Input terminal function selection 2 (f112)
2 ST Input terminal function selection 3 (f113)
3 RES Input terminal function selection 4 (f114)
4 S1 Input terminal function selection 5 (f115)
5 S2 Input terminal function selection 6 (f116)
6 S3 Input terminal function selection 7 (f117)
7 S4 Input terminal function selection 8 (f118)
OFF ON
8 L1 Input terminal function selection 9 (f119)
9 L2 Input terminal function selection 10 (f120)
10 L3 Input terminal function selection 11 (f121)
11 L4 Input terminal function selection 12 (f122)
12 L5 Input terminal function selection 13 (f123)
13 L6 Input terminal function selection 14 (f124)
14 L7 Input terminal function selection 15 (f125)
15 L8 Input terminal function selection 16 (f126)

Example: Data set for FE06 when the F and S1 terminals are ON = 0011H
BIT15 bit0
FE06: 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1
0 0 0 9

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 E6581315

◼ Output terminal board status (FD07, FE07)

Output terminal board status (current status): “Communication Number FD07”
Output terminal board status (status immediately before the occurrence of a trip): “Communication
Number FE07”
Using terminal function selection parameters, functions can be assigned individually to the termi-
nals on the output terminal board.
When using a terminal as a monitoring terminal, check beforehand the function assigned to each
terminal.

Data composition of output terminal board status (FD07, FE07)

Bit Terminal name Function (parameter title) 0 1
0 OUT1 Output terminal function selection 1 (f130)
1 OUT2 Output terminal function selection 2 (f131)
2 FL Output terminal function selection 3 (f132)
3 OUT3 Output terminal function selection 4 (f133)
4 OUT4 Output terminal function selection 5 (f134)
5 R1 Output terminal function selection 6 (f135) OFF ON
6 OUT5 Output terminal function selection 7 (f136)
7 OUT6 Output terminal function selection 8 (f137)
8 R2 Output terminal function selection 9 (f138)
9 R3 Output terminal function selection 10 (f168)
10 R4 Output terminal function selection 11 (f169)
11 to
(Undefined) － － －
15
Note: The bit described “Undefined” is unstable. Don’t use the bit for the judgement.

Example: Data set for FE07 when both the OUT1 and OUT2 terminals are ON = 0003H
BIT15 bit0
FE07: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1
0 0 0 3

◼ Monitoring of the analog input with the computer (FE35 to FE39)

RR/S4 terminal board monitor: “Communication Number FE35”
VI/II terminal board monitor: “Communication Number FE36”
RX terminal board monitor: “Communication Number FE37”
Option AI1 terminal board monitor : “Communication Number FE38”
Option AI2 terminal board monitor: “Communication Number FE39”

These monitors can also be used as A/D converters irrespective of the inverter’s control.
RR terminal board monitor, VI/II terminal board monitor and AI2 terminal board monitor are capa-
ble of reading the data from external devices in a range of 0.01 to 100.00% (unsigned data: 0H to
2710H).
RX terminal board monitor and AI1 terminal board monitor are capable of reading the data from
external devices in a range of -100.00 to +100.00% (signed data: D8F0H to 2710H).
If analog input mode is selected with the frequency setting mode selection parameter, however,
keep in mind that any data entered via an analog terminal is regarded as a frequency command.

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 E6581315

◼ Inverter operating status 1 (FD01, FE01)

Inverter status 1 (current status): Communication Number FD01
Inverter status 1 (status immediately before the occurrence of a trip): Communication Number FE01

Bit Specifications 0 1 Remarks

0 Failure FL No output Output in progress
1 Failure Not tripped Tripped Trip statuses include 
and trip retention status.
2 Alarm No alarm Alarm issued
3 (Undefined) - -
4 Motor section (1 or 2) Motor 1 (THR 1) Motor 2 (THR 2)
(THR 2 selection)
5 PID control OFF PID control PID control
permitted prohibited
6 Accelera- Acceleration/ Acceleration/ AD1 :, 
tion/deceleration deceleration deceleration pat- AD2 :, 
pattern selection (1 pattern 1 (AD 1) tern 2 (AD 2)
or 2)
7 DC braking OFF Forced DC braking
8 Jog run OFF Jog run
9 Forward/reverse run Forward run Reverse run
10 Run/stop Stop Run
11 Coast stop (ST=OFF) ST=ON ST=OFF
12 Emergency stop Not emergency Emergency stop
stop status status
13 Standby ST=ON Start-up process Standby Standby: Initialization complet-
ed, not failure stop status, not
alarm stop status (MOFF, LL
forced stop or forced stop due to
a momentary power failure),
ST=ON, and RUN=ON
14 Standby Start-up process Standby Standby: Initialization complet-
ed, not failure stop status, and
not alarm stop status (MOFF, LL
forced stop or forced stop due to
a momentary power failure)
15 (Undefined) - -
Note: The bit described “Undefined” is unstable. Don’t use the bit for the judgement.

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 E6581315

◼ Inverter operating status 2 (FD42, FE42)

Inverter status 2 (current status): Communication Number FD42
Inverter status 2 (status immediately before the occurrence of a trip): Communication Number FE42

Bit Function 0 1 Remarks

0 Control mode switching Speed control Torque control
(Simple posi-
tioning)
1 Electric Power Counting Counting Resetting
(FE76,FE77) status
2 (Undefined) - -
3 (Undefined) - -
4 Preliminary excitation Normal Operation
5 (Undefined) - -
6 (Undefined) - -
7 Maximum deceleration forced Normal Operation
stop
8 Acceleration/deceleration 00:Acceleration/deceleration 1 Acceleration/ decelera-
pattern selection1 01:Acceleration/deceleration 2 tion 1 - 4 can be speci-
9 Acceleration/deceleration 10:Acceleration/deceleration 3 fied by combination of
pattern selection2 11:Acceleration/deceleration 4 two bits
10 V/Fswitching 1 00: V/F 1 Select V/F 1 - 4 by com-
11 V/Fswitching 2 01: V/F 2 bination of two bits
10: V/F 3
11: V/F 4
12 Torque limit switching 1 00: Torque limit 1 Select torque limit 1 - 4
13 Torque limit switching 2 01: Torque limit 2 by combination of two
10: Torque limit 3 bits
11: Torque limit 4
14 Speed gain 1/2 Gain 1 Gain 2 Gain 1: , 
Gain 2: , 
15 (Undefined) - -
Note: The bit described “Undefined” is unstable. Don’t use the bit for the judgement.

◼ Inverter operating status 3 (FD49, FE49)

Inverter status 3 (current status): Communication Number FD49
Inverter status 3 (status immediately before the occurrence of a trip): Communication Number FE49

Bit Function 0 1 Remarks

0 to 11 (Undefined) - -
12 Acceleration/deceleration Not achieved Achieved Related parameters
completion (RCH) f102
13 Specified speed reach (RCHF) Not achieved Achieved Related parameters
f101, f102
14 to 15 (Undefined) - -
Note: The bit described “Undefined” is unstable. Don’t use the bit for the judgement.

◼ Inverter operating status 4 (FD59, FE59)

Inverter status 4 (current status): Communication Number FD59
Inverter status 4 (status immediately before the occurrence of a trip): Communication Number FE59

Bit Function 0 1 Remarks

0 to 11 (Undefined) - -
12 Power Removal OFF ON
13 to 15 (Undefined) - -
Note: The bit described “Undefined” is unstable. Don’t use the bit for the judgement.

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 E6581315

◼ Inverter operating command mode status (FD45, FE45)

The monitor of the command mode that the present condition is enabled

Command mode status (current status): “Communication Number FD45”

Command mode status (status immediately before the occurrence of a trip): “Communication
Number

Data Enabled command

0 Terminal input enabled
1 Operation panel input enabled
2 Operation panel RS485 (2-wire) communication input
3 Internal RS485 (4-wire) communication input
4 Communication option input

◼ Inverter operating frequency mode status (FD46, FE46)

The monitor of the frequency command mode that the present condition is enabled
Note that Preset speed operation frequencies is given the priority independent of the frequency
mode, in which case this monitor will be disabled, in case Preset speed operation frequencies is
selected.

Frequncy mode status (current status): Communication Number FD46

Frequncy mode status (status immediately before the occurrence of a trip): Communication
Number FE46

Data Enabled frequency

1 VI/II input
2 RR/S4 input
3 RX input
4 Operation panel input enabled
5 Operation panel RS485 (2-wire) communication input
6 Internal RS485 (4-wire) communication input
7 Communication option input
8 Optional AI1
9 Optional AI2
10 UP/DOWN frequency
11 RP pulse input
12 High-speed pulse input
13 Binary/BCD input
255 Preset speed operation

◼ Output motor speed monitor (FE90)

Output motor speed monitor (status immediately before the occurrence of a trip) :
Communication Number FE90

Ex.: Output motor speed monitor (during 60 Hz operation and 4pole (f856 = 2:4pole)
... (0708H = 1800d, 1800min-1)
The number of motor poles is selected by to f856.
The output moter speed is converted from the output frequency by the following calculation
formula.

Output morter speed = (120 x Output frequency [0.01Hz] ) ÷ poles [f856]

1800 min-1 = (120 x 60.00Hz) ÷ 4 poles

Computer → Inverter Inverter → Computer

(RFE90) CR (RFE900708) CR

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 E6581315

◼ Alarm information monitor 1 (FC91)

Remarks
Bit Specifications 0 1
(Panel indication)
0 Overcurrent pre-alarm Normal Alarming 
1 Inverter overload pre-alarm Normal Alarming 
2 Motor overload pre-alarm Normal Alarming 
3 Overheat pre-alarm Normal Alarming 
4 Overvoltage pre-alarm achiev- Normal Alarming 
ing PBR operation level
5 Main circuit undervoltage de- Normal Alarming -
tected
6 (Undefined) - - -
7 Low current alarm Normal Alarming -
8 Overtorque detection Normal Alarming -
9 Braking resistor overload Normal Alarming -
pre-alarm
10 Cumulative operation time Normal Alarming f621
alarm
11 PROFIBUS/DeviceNet/CC-Link Normal Alarming t
communication error
12 RS485 communication error Normal Alarming t
13 Main circuit undervoltage de- Normal Alarming moff
tected alarm
14 Forced deceleration stop be- - Decelerating, stop
cause of a momentary power stopping
failure
15 Pre-alarm stop because of pro- - Decelerating, lstp
longed lower-limit frequency stopping
operation
Note: The bit described “Undefined” is unstable. Don’t use the bit for the judgement.

◼ Alarm information monitor 2 (FC92)

Bit Specifications 0 1 Remarks
0 (Undefined) - - -
1 (Undefined) - - -
2 Life time alarm Normal Alarming Bit0 to 2 of FE79
3 Over torque alarm Normal Alarming From f615 to f619
4 Over load stall alarm Normal Alarming olm
5 Control circuit option alarm Normal Alarming coff flickering
6 (Undefined) - - -
7 VI/II input disconnection alarm Normal Alarming f644 , a-18
8-15 (Undefined) - - -
Note: The bit described “Undefined” is unstable. Don’t use the bit for the judgement.

◼ Cumulative operation time alarm monitor (FE79)

Bit Specifications 0 1 Remarks

0 Fan life alarm Normal Alarm issued -
1 Circuit board life alarm Normal Alarm issued -
2 Main-circuit capacitor life alarm Normal Alarm issued -
3 Cumulative operation time alarm Normal Alarm issued f621
4-15 (Undefined) - - -
Note: The bit described “Undefined” is unstable. Don’t use the bit for the judgement.

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 E6581315

◼ Trip code monitor (current status: FC90: historic records: FE10 to FE13)
Data Data
Code (hexadeci- (decimal Description
mal number) number)
nerr 0 0 No error
oc1 1 1 Over-current during acceleration
oc2 2 2 Over-current during deceleration
oc3 3 3 Over-current during constant speed operation
ocl 4 4 Over-current in load at startup
ocai 5 5 U-phase arm overcurrent
oca2 6 6 V-phase arm overcurrent
oca3 7 7 W-phase arm overcurrent
ephi 8 8 Input phase failure
epho 9 9 Output phase failure
op1 A 10 Overvoltage during acceleration
op2 B 11 Overvoltage during deceleration
op3 C 12 Overvoltage during constant speed operation
ol1 D 13 Over-LOAD in inverter
ol2 E 14 Over-LOAD in motor
olr F 15 Dynamic braking resistor overload
oh 10 16 Overheat
e 11 17 Emergency stop
eep1 12 18 EEPROM fault
eep2 13 19 Initial read error
eep3 14 20 Initial read error
err2 15 21 Inverter RAM fault
err3 16 22 Inverter ROM fault
err4 17 23 CPU fault
err5 18 24 Communication time-out error
err6 19 25 Gate array fault
err7 1A 26 Output current detector error
err8 1B 27 Option error
uc 1D 29 Low current operation status
up1 1E 30 Undervoltage (main circuit)
ot 20 32 Over-torque trip
ef1 21 33 Ground fault trip
ef2 22 34 Ground fault trip
ocr 24 36 Dynamic braking abnormal element
oc1p 25 37 Overcurrent during acceleration (element overheat)
oc2p 26 38 Overcurrent during deceleration (element overheat)
oc3p 27 39 Overcurrent during fixed speed operation (element overheat)
etn 28 40 Tuning error
etyp 29 41 Inverter type error
e-10 2A 42 Analog input terminal overvoltage
e-11 2B 43 Abnormal brake sequence
e-12 2C 44 Disconnection of encoder
e-13 2D 45 Speed error
oh2 2E 46 External thermal
sout 2F 47 Step-out (for PM motors only)
e-18 32 50 Terminal input error
e-19 33 51 Abnormal CPU2 communication
e-20 34 52 V/f control error
e-21 35 53 CPU1 fault
e-22 36 54 Abnormal logic input voltage
e-23 37 55 Option 1 error
e-24 38 56 Option 2 error
e-25 39 57 Stop position retaining error

58
 E6581315
e-26 3A 58 CPU2 fault
etn1 54 84  tuning error
etn2 55 85  tuning error
etn3 56 86 Motor constant setting error

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 E6581315

8.3. Utilizing panel (LEDs and keys) by communication

The VF-AS1 can display data that is not related to the inverters through an external controller or
other means. Input by key operations can also be executed. The use of inverter resources re-
duces the cost for the entire system.

8.3.1. LED setting by communication

Desired LED information can be displayed by communication.

<How to Set>
Set the standard monitor display selection parameter to “communication LED setting
(=).”
When in the standard monitor mode status, LED information is displayed according to the setting
of Communication Number FA65. (Set to Communication Number FA65 = 1 and initial data
“” in shipment setting)
In case of an alarm while setting communication LEDs, the alarm display will alternately display
specified LED data and alarm message.
For example, if an over-current alarm (alarm display “”) occurs while “.” is displayed by this
function, “” and “.” will be displayed alternately.

Commu-
Shipment
nication Parameter Name Range
setting
Number.
FA65 Select display by communication 0: Numeric data (FA66, FA67, FA68) 1
1: ASCII data 1 (FA70, FA71, FA72, FA73,
FA74)
2: ASCII data 2 (FA75, FA76, FA77, FA78,
FA79)
FA66 Numeric display data 0-9999 0
(Enabled if FA65=0)
FA67 Decimal point position 0: No decimal point (xxxx) 0
(Enabled if FA65=0) 1: First digit below decimal point (xxx.x)
2: Second digit below decimal point (xx.xx)
FA68 LED data 0 for unit 0:Hz off, % off, 1:Hz on, % off 0
(Enabled if FA65=0) 2:Hz off, % on, 3:Hz on, % on
FA70 ASCII display data 1, first digit from 0 – 127 (0 – 7FH) 64H (’d’)
left (See ASCII LED display code chart)
(Enabled if FA65=1)
FA71 ASCII display data 1, second digit 0 – 256 (0 – FFH) 41H (’A’)
from left (See ASCII LED display code chart)
(Enabled if FA65=1)
FA72 ASCII display data 1, third digit from 0 – 256 (0 – FFH) 74H (’t’)
left (See ASCII LED display code chart)
(Enabled if FA65=1)
FA73 ASCII display data 1, fourth digit 0 – 127 (0 – 7FH) 41H (’A’)
from left (See ASCII LED display code chart)
(Enabled if FA65=1)
FA74 LED data 1 for unit 0:Hz off, % off, 1:Hz on, % off 0
(Enabled if FA65=1) 2:Hz off, % on, 3:Hz on, % on
FA75 ASCII display data 2, first digit from 0 – 127 (0 – 7FH) 30H (’0’)
left (See ASCII LED display code chart)
(Enabled if FA65=2)
FA76 ASCII display data 2, second digit 0 – 256 (0 – FFH) 30H (’0’)
from left (See ASCII LED display code chart)
(Enabled if FA65=2)
FA77 ASCII display data 2, third digit from 0 – 256 (0 – FFH) 30H (’0’)
left (See ASCII LED display code chart))
(Enabled if FA65=2)
FA78 ASCII display data 2, fourth digit 0 – 127 (0 – 7FH) 30H (’0’)
from left (See ASCII LED display code chart)
(Enabled if FA65=2)
FA79 LED data 2 for unit 0:Hz off, % off, 1:Hz on, % off 0
(Enabled if FA65=2) 2:Hz off, % on, 3:Hz on, % on

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 E6581315

◼ Block Communication Function for LED Display

To display LED data for ASCII display that is synchronized to each digit, set data for each digit and
validate this set data by display selection by communication (Communication Number FA65).
Synchronization can also be achieved by batch writing LED data parameters after changing the
following block communication mode parameters and by sending data by block communication.
Writing in the block communication function will be writing in the RAM only due to the EEPROM life
for write operations. The LED data will reset to the initial value ““ when the power is
turned off, in failure resetting or when standard shipment settings are set.

◼ Parameter Setting
“Block communication mode (Communication Number FA80)”

Setting range: 0, 1 (Initial value 0)

0: Block communication parameters ( - ) is used
1: LED display ASCII data is used (When writing, ASCII display data 1 [Communication
Number FA70 - FA74], when reading, LED data displayed before change)

*To validate LED data set by using LED display block communication, set standard monitor display
selection to “communication LED select ( = ) and display selection by communication
to “ASCII data 1 (Communication Number FA65).

◼ Format
The format is the same as that used in the usual block communication mode. (For the detail in-
formation, see “4.1.3 Block communication transmission format”) The block communication pa-
rameters ( - ) will become invalid. Write data will become ASCII display data 1
(Communication Number :FA70 - FA74) fixed. LED display data that is actually being output will
be read during reading. The specification range for write operations is 0 to 5.

◼ Example
Communication LED selection ( = ) for standard monitor display selection.
ASCII data 1 (Communication Number:FA65 = 1) for display selection by communication.
LED display ASCII data (Communication Number: FA80 = 1) for the block communication mode.
Current LED display status is display of initial value “”

PC → Inverter: 2F580505003000310032003300035A・・・“” display command

Inverter → PC: 2F59050000640041007400410000E7 ・・・ “” displayed before change

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 E6581315
■ ASCII LED display data code (00H-1FH are blank.)
Hex Code Display Char. Hex Code Display Char. Hex Code Display Char. Hex Code Display Char.

00H BLANK 20H BLANK SP 40H BLANK @ 60H BLANK `

01H BLANK 21H BLANK ! 41H A 61H a

02H BLANK 22H BLANK 42H B 62H b

03H BLANK 23H BLANK # 43H C 63H c

04H BLANK 24H BLANK $ 44H D 64H d

05H BLANK 25H BLANK % 45H E 65H e

06H BLANK 26H BLANK & 46H F 66H f

07H BLANK 27H BLANK 47H G 67H g

08H BLANK 28H ( 48H H 68H h

09H BLANK 29H ) 49H I 69H i

0AH BLANK 2AH BLANK * 4AH J 6AH j

0BH BLANK 2BH BLANK + 4BH K 6BH k

0CH BLANK 2CH DGP , 4CH L 6CH l

0DH BLANK 2DH - 4DH M 6DH m

0EH BLANK 2EH DGP . 4EH N 6EH n

0FH BLANK 2FH / 4FH O 6FH o

10H 30H 0 50H P 70H p

11H 31HT 1 51H Q 71H q

12H 32H 2 52H R 72H r

13H 33H 3 53H S 73H s

14H 34H 4 54H T 74H t

15H 35H 5 55H U 75H u

16H 36H 6 56H V 76H v

17H 37H 7 57H BLANK W 77H BLANK w

18H 38H 8 58H BLANK X 78H BLANK x

19H 39H 9 59H Y 79H y

1AH 3AH BLANK : 5AH BLANK Z 7AH BLANK z

1BH 3BH BLANK ; 5BH [ 7BH {

1CH 3CH < 5CH ＼ 7CH BLANK |

1DH 3DH = 5DH ] 7DH }

1EH BLANK 3EH > 5EH ^ 7EH BLANK →

1FH BLANK 3FH BLANK ? 5FH _ 7FH BLANK

*Dots to show decimal points and other uses can be added by setting (80H) Bit 7 (highest bit).
Example: “0.” to display “60.0” can be added by “30H + 80H = B0H.”

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 E6581315

8.3.2. Key utilization by communication

The VF-AS1 can use the panel keys on the inverters through external communication.

◼ Key Monitoring Procedure

Set panel key selection (Communication Number: FA10) to “1” to set the external key mode.
However, if communication duration is less than 1sec to avoid an inverter operation shutdown in
communication disruption, communication must always be maintained, such as monitoring key
data and LED data to automatically reset inverter operations to inverter key operation (FA10 = 0).
Set to the external communication key mode (FA10 = 1) to disable the key function of the inverters
so that inverter operation will not be affected by pressing of the keys on the inverters. By moni-
toring key information, which is input by the keys on the inverters in this condition, through inverter
key data (Communication Number; FC01), the keys on the inverters can be operated through a
controller and other devices.
* When the key mode is the external key mode, key operation as an inverter function is disabled
and the inverters cannot be stopped by pressing the STOP key to stop inverter operation. Enable
emergency stop through an external terminal or other device when an inverter stop is desired.

Panel Key Selection (Communication Number:FA10)

The panel key selection parameter (Communication Number; FA10) discriminates which keys are to be used, panel
keys on the inverters or keys sent by external communication, as panel keys used in panel processing of the inverters.

Communication No.：FC01

Panel key data of inverters

FA10=”0”
Communication No.：FC00

Key data for inverter con-

Communication No.：FA11 trol panel processing
FA10=”1”
External communication
key data

Keys on inverters enabled (Communication Number; FA10 = 0):

Key data: Data of keys on inverters (Communication Number : FC01)

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

KPP EASY ENT MODE DOWN UP STOP RUN
“KPP” for Bit 7 indicates that panel keys are mounted on the inverters.

External keys enabled (Communication Number; FA10 = 1):

Key data: External key data (Communication Number: FA11)

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

- EASY ENT MODE DOWN UP STOP RUN

Key monitoring (Communication Number : FC00):

Information of the enabled keys on the inverters can be monitored.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

KPP EASY ENT MODE DOWN UP STOP RUN
“KPP” for Bit 7 indicates that panel keys are enabled on the inverters.

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9. Parameter data
Explanation of parameters for VF-AS1 series is described here. For communication purposes, see
the parameter list on inverter's instruction manual regarding the communication number, adjust-
ment range and so forth.

◼ Referring to the parameter list

<Example of excerpts from the inverter’s instruction manual>

Minimum
Commu- setting unit Ref-
Default Write during
Title nication Function Adjustment range (Panel/Communi er-
setting running
No. cation) ence

auh - History function 1/1 - - 5.1

au1 0000 Automatic acce- 0:Deselect 1/1 0 Disabled 5.2
lera- 1:Automatic setting
tion/deceleration 2:Automatic setting (during
acceleration only)
au2 0001 Automatic torque 0:Deselect 1/1 - Disabled 5.3
boost 1:Automatic torque boost +
auto-tuning 1
： ：
： ：

acc
Acceleration time 0.1~6000 sec.
0009 0.1/0.1 *2 *1 Enabled 5.2
1
0: -
1:50 Hz default setting
2:60 Hz default setting
3:Factory default setting
：
typ
Factory default 10:Acceleration/deceleration
0007 1/1 - Disabled 5.20
setting time setting 0.01
sec.~600.0 sec.
11:Acceleration/deceleration
time setting 0.1
sec.~6000sec.
：
*1: Default values vary depending on the capacity.
*2: Changing the parameter  enables to set to 0.01 sec. (adjustment range: 0.01~600.0 sec.).

- The summary of parameter list relating to the communication is as follows.

(1) “Title” means the display on the inverter panel.

(2) “Communication number” is affixed to each parameter that is necessary for designating the parameter for
communication.
(3) "Adjustment range" means a data range adjustable for a parameter, and the data cannot be written outside the
range. The data have been expressed in the decimal notation. For writing the data through the communication
function, take the minimum setting unit into consideration, and use hexadecimal system.
(4) "Minimum setup unit" is the unit of a single data (when the minimum unit is "-", 1 is equal to 1).
For example, the "minimum setup unit" of acceleration time () is 0.01, and 1 is equal to 0.01s. For setting a
data to 10 seconds, transmit 03E8h [10÷0.01=1000d=03E8h] by communication.

(5) If FA09 is set to 0, the acceleration/deceleration time parameters acc, dec, f500, f501, f510,
f511, f514, and f515 can be set in units of 0.01 sec.
◼ Acceleration/deceleration setting time unit (FA09)
Communication No. Function name Unit Adjustment range
FA09 Acceleration/deceleration time unit 0: 0.01 sec. (0.01-600.0)
－
1: 0.1 sec. (0.1-6000.0)

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 E6581315
◼ Command parameters

For those parameters that contain data only in the RAM and not in the EEPROM, their data return
to initial values when the power is turned off, in failure resetting, or when standard shipment set-
tings are set. Note that parameters without data storage in the EEPROMs will be written in the
RAM only even if the command W (writing in EEPROMs and RAM) is executed.

◼ Commands NOTE : Data is expressed in decimal nota-

tion.
Communica- Min. Write
tion Adjustment Range Initial EEP
Num-
Function Setting During
Value Operation ROM
ber.(HEX) Unit
FA00 Command 1 (2-wire RS485)＊1 0 to 65535 － 0 yes None
FA01 Frequency command value 0 to Max. frequency 0.01Hz 0 yes None
(2-wire RS485)＊1 ()
FA03 Operation panel operation fre- Low-limit frequency 0.01Hz 0 yes Available
quency *2 () to High-limit
frequency ()
FA04 Command 1 (4-wire RS485)＊1 0 to 65535 － 0 yes None
FA05 Frequency command value 0 to Max. frequency 0.01Hz 0 yes None
(4-wire RS485)＊1 ()
FA10 Panel key selection＊4 0: Main unit － 0 yes None
1: Comunication
FA11 External communication key 0 to 65535 － 0 yes None
data＊4
FA13 Motor speed command (FA13) 0 to 24000min-1 1min-1 0 yes None
FA20 Command 2 (2-wire RS485) ＊1 0 to 65535 － 0 yes None
FA22 Command 2 (4-wire RS485) ＊1 0 to 65535 － 0 yes None
FA30 Torque command value (2-wire -250.00 to 250.00 0.01% 0 yes None
RS485)
FA32 Torque command value (4-wire -250.00 to 250.00 0.01% 0 yes None
RS485)
FA50 Terminal output data＊3 0 to 255 1 0 yes None
FA51 FM analog output data＊3 0 to 2047 1 0 yes None
(11-bit resolution)
FA52 AM analog output data＊3 0 to 2047 1 0 yes None
(11-bit resolution)
FA53 MON1 analog output data＊3 0 to 2047 1 0 yes None
(11-bit resolution)
FA54 MON2 analog output data＊3 0 to 2047 1 0 yes None
(11-bit resolution)
FA65 Select display by communica- 0 to 2 － 1 yes Available
tion＊4
FA66 Numerical display data＊4 0-9999 1 0 yes Available
FA67 Decimal point position＊4 0 to 2 － 0 yes Available
FA68 LED data for unit 0＊4 0 to 3 － 0 yes Available
FA70 ASCII display data 1 0 to 127 － 100 yes Available
First digit from left＊4 (‘d’)
FA71 ASCII display data 1 0 to 255 － 65 yes Available
Second digit from left＊4 (‘A’)
FA72 ASCII display data 1 0 to 255 － 116 yes Available
Third digit from left＊4 (‘t’)
FA73 ASCII display data 1 0 to 127 － 65 yes Available
Fourth digit from left＊4 (‘A’)
FA74 LED data for unit1＊4 0 to 3 － 0 yes Available
FA75 ASCII display data 2 0 to 127 － 48 yes Available
First digit from left＊4 (‘0’)
FA76 ASCII display data 2 0 to 255 － 48 yes Available
Second digit from left＊4 (‘0’)
FA77 ASCII display data 2 0 to 255 － 48 yes Available
Third digit from left＊4 (‘0’)
FA78 ASCII display data 2 0 to 127 － 48 yes Available
Fourth digit from left＊4 (‘0’)
FA79 LED data for unit 2＊4 0 to 3 － 0 yes Available
FA80 Block communication mode＊4 0 to 1 － 0 yes Available

65
 E6581315
＊1
: Enable the communication command or communication frequency setting before setting these
parameters are set. Otherwise, the parameters will not function. See “8.1 Command by
communication” for the method to enable them.
＊2
: Note that the Communication Number for operation panel operation frequency is FA02 in the
VF-S7 and VF-S9 series.
＊3
: See “8.1 Communication commands (commande from the computer)” for the detail information.
＊4
: See “8.3 Utilizing panel (LEDs and keys) by communication” for the detail information.

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◼ Monitor parameters *These Parameters are read-only (monitor-only) parameters.

Communication No.
Function Unit Remarks
Current value Trip data held
FB05 － Inverter capacity code － Refer to Appendix6
FB07 － Inverter series type － The value of
VFAS1 is 176.
FC00 － Monitor of key data (Effective
－ Refer to Section
data)
8.3.
FC01 － Monitor of inverter keypad data －
FC90 － Trip code －
FC91 － Alarm information 1 －
Refer to Section
FC92 － Alarm information 2 －
8.2.
]FD00 FE00 Output frequency 0.01Hz
FD01 FE01 Inverter operating status 1 －
FD02 FE02 Frequency command value 0.01Hz
FD03 FE03 Output current 0.01%
FD04 FE04 Input voltage (DC detection) 0.01%
FD05 FE05 Output voltage 0.01%
FD06 FE06 Input terminal information － Refer to Section
FD07 FE07 Output terminal information － 8.2.
FE08 － CPU version 1 (application) －
FE10 － Past trip 1 (latest) －
FE11 － Past trip 2 － Refer to Section
FE12 － Past trip 3 － 8.2.
FE13 － Past trip 4 (earliest) －
FE14 － Cumulative operation time 1h
FD15 FE15 Compensated frequency 0.01Hz
FD16 FE16 Speed feedback (real time) 0.01Hz
FD17 FE17 Speed feedback (1-sec. filter) 0.01Hz
FD18 FE18 Torque 0.01%
FD19 FE19 Torque command 0.01%
FD20 FE20 Torque current 0.01%
FD21 FE21 Exciting current 0.01%
FD22 FE22 PID feedback value 0.01Hz
FD23 FE23 Motor overload factor (OL2 data) 0.01%
FD24 FE24 Inverter overload factor (OL1
0.01%
data)
FD25 FE25 Regenerative braking resistance
1%
overload factor (OLr data)
FD26 FE26 Motor load factor 1%
FD27 FE27 Inverter load factor 1%
FD28 FE28 Regenerative braking resistance
1%
load factor
FD29 FE29 Input power 0.01kW
FD30 FE30 Output power 0.01kW
FE35 － RR/S4 input 0.01%
FE36 － VI/II input 0.01%
Refer to Section
FE37 － RX input 0.01%
8.2.
FE38 － Option AI1 0.01%
FE39 － Option AI2 0.01%
FE40 － FM output 1
FE41 － AM output 1
FD42 FE42 Inverter operating status 2 Refer to Section
－
8.2.
－ FE43 MON1 output (analog option 1) 1
－ FE44 MON2 output (analog option 2) 1
FD45 FE45 Command mode status － Refer to Section

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 E6581315
FD46 FE46 Frequency setting mode status － 8.2.
FD48 FE48 PID command 0.01Hz
FD49 FE49 Inverter operating status 3 Refer to Section
－
8.2.
FD50 － Light-load high-speed torque 1 0.01%
FD51 － Light-load high-speed torque 2 0.01%
FD59 FE59 Inverter operating status 4 Refer to Section
－
8.2.
FE60 － MY monitor 1 1
FE61 － MY monitor 2 1
FE62 － MY monitor 3 1
FE63 － MY monitor 4 1
FE70 － Rated current 0.1A
FE71 － Rated voltage 0.1V
FE73 － CPU version 2 (motor) －
FE76 － Integral input power It depends
FE77 － Integral output power on F749.
FE79 － Part replacement alarm infor- Refer to Section
－
mation 8.2.
FE80 － Cumulative power ON time 1h
FD84 FE84 Binary input value (option) 1
－ FE90 Output motor speed monitor Refer to Section
1min-1
8.2.

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 E6581315

Appendix 1 Table of data codes

• JIS (ASCII) codes

Higher order
0 1 2 3 4 5 6 7
Lower order
0 NUL TC7(DLE) (SP) ０ ＠ Ｐ 、 ｐ
1 TC1(SOH) DC1 ! １ Ａ Ｑ ａ ｑ
2 TC2(STX) DC2 ” ２ Ｂ Ｒ ｂ ｒ
3 TC3(ETX) DC3 ＃ ３ Ｃ Ｓ ｃ ｓ
4 TC4(EOT) DC4 ＄ ４ Ｄ Ｔ ｄ ｔ
5 TC5(ENQ) TC8(NAK) ％ ５ Ｅ Ｕ ｅ ｕ
6 TC6(ACK) TC9(SYN) ＆ ６ Ｆ Ｖ ｆ ｖ
7 BEL TC10(ETB) ’ ７ Ｇ Ｗ ｇ ｗ
8 FE0(BS) CAN （ ８ Ｈ Ｘ ｈ ｘ
9 FE1(HT) EM ） ９ Ｉ Ｙ ｉ ｙ
A FE2(LF) SUB ＊ ： Ｊ Ｚ ｊ ｚ
B FE3(VT) ESC ＋ ； Ｋ ［ ｋ ｛
C FE4(FF) IS4(FS) ， ＜ Ｌ ￥ ｌ ｜
D FE5(CR) IS3(GS) － ＝ Ｍ ］ ｍ ｝
E SO IS2(RS) ． ＞ Ｎ ＾ ｎ ￣
F SI IS1(US) ／ ？ Ｏ ＿ ｏ DEL
CR: Carriage return
Ex.: Code 41 = Character A

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 E6581315

Appendix 2 Response time

The communication response time can be calculated from data communication time and inverter
processing time. When wishing to know the communication response time, calculate using the
following as a reference

Interval corresponding to 3.5 bytes

Data processing time of inverter (Approx. 8 ms)
Data transmission time
Data transmission time

PC → Inverter
Inverter → PC
Response time

◼ Data transmission time

1
Data transmission time =  number of by testransmitted  number of bits
baud rate
* Number of bits = start bit + data frame length + parity bit + stop bit
* Minimum number of bits = 1 + 8 + 0 + 1 = 10 bits
* Maximum number of bits = 1 + 8 + 1 + 2 = 12 bits

<An example of the calculation of the transmission time: 19200 bps, 8 bytes, 11 bits>
1
Data transmission time =  8  11 = 4.6ms
19200

◼ Data processing time of inverter

Data processing time: maximum 8 ms

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 E6581315

Appendix 3 Compatibility with the communication

function of the VF-A7
To provide consistency in communication procedures, the communication function of the VF-AS1
series of inverters has been designed based on the protocols used for the Toshiba VF-A7 series of
inverters. With regard to compatibility, however, VF-A7 users should check the items described
below before using the communication function of their inverters.

◼ To VF-AS1 inverter users:

Some parameters of the VF-A7 are different from those of the VF-AS1 in function or adjustment
range (upper and lower limits), even though they have the same title or the same communication
number. So, when accessing a parameter, consult the VF- A7 inverter’s instruction manual to see
if the parameter is identical to the corresponding parameter of the VF-AS1. If the parameter differs,
modify the computer program to suit your inverter. To avoid hazards, never copy parameters from
one model of inverter to another.

◼ Comparison of communication-related items

The table below gives a comparison of communication-related items to be kept in mind when re-
placing VF-A7 inverters with VF-AS1 inverters or when connecting VF-A7 inverters and VF-AS1
inverters to the same network. It does not cover any items common to the VF-A7 and VF-AS1 se-
ries of inverters.

Model
VF-A7 series VF-AS1 series Reference
Item
32-bit mode For some parameters, including acceler- 32-bit mode is not available. For all Refer to
ation/deceleration time parameters, data parameters, access is made in 16-bit Section 9.
communication are carried out in 32-bit mode.
mode.
Handling of negative Access is made in 32-bit mode. Access is made in 16-bit mode. To －
data specified with pa- see if the value specified with a pa-
rameters rameter is signed or not, check the
adjustment range of the parameter.
Division of a frame A frame can be sent with it divided into No frame can be divided into smaller Refer to
smaller frames if all the frames can be frames. Do not place an interval cor- Section
sent within approx. 0.5 sec. responding to less than 1.5 bytes of 3.1.
data between frames to be sent.
Communication 0.5 sec. 0.1 sec.
time-out period (guide)
Receipt information in Even if there is receipt information in A frame must always begin with a
front of the start code front of the start code of a frame re- start code, otherwise it will be reject-
ceived, the frame is assumed to begin ed.
with the start code.
Reset command When an inverter receives a reset com- When an inverter receives a reset Refer to
mand, it sends back a response before it command, it sends back no response. Section
is reset. 8.1.
RS485 baud rate 1200 to 38400 bps 9600 to 38400 bps Refer to
Section
7.1.

Notice
 Do not use communication programs written for another series of inverters.
Even though parameters have the same title and the same communication number, they may be different
in function. When using a parameter, always check its specifications in the instruction manual for your
inverter. If the specifications of the parameter differ, modify the computer program to suit your inverter.
 To avoid hazards, do not copy parameters from one model of inverter to another.
Even though parameters have the same titles and communication numbers, they may be different in
function.

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Appendix 4 Troubleshooting
If a problem arises, diagnose it in accordance with the following table before making a service call.
If the problem cannot be solved by any remedy described in the table or if no remedy to the prob-
lem is specified in the table, contact your Toshiba dealer.

Problem Remedies Reference

Communication will not take - Are both the computer and the inverter turned on?
place. - Are all cables connected correctly and securely?
- Are the same baud rate, parity and bit length set for every unit on the Chapter 7
network?
An error code is returned. Section 4.1
- Is the data transmission format correct? Section 5.1
- Does the data written fall within the specified range? Chapter 9
- Some parameters cannot be written during inverter operation. Inverter
Changing should be attempted when the inverter is in halt. instruction
manual
The trip err5 and alarm t - Check the cable connection and the timer setting. Section 7.3
occur.
Frequency instructions from the - Is the frequency setting mode selection parameter set to “comput- Section 8.1
computer have no effect. er”?
Commands, including the run - Is the command mode selection parameter set to “computer”? Section 8.1
and stop commands, from the
commuter have no effect.
During 2-wire RS485 communi- - When it is used to network communication, must use 4-wire RS485 Section 6
cation, cann’t infrequently conect communication.
an inverter - When it connect to 2-wire RS485 other than our company option, Refer to
refer to Appendix 5. Appendix
5.
During RS485 communication, - Is the inverter connected correctly? Refer to
an inverter sends back respons- - Are you sure the receive line and the send line are not in contact with Appendix
es repeatedly an infinite number each other? 2.
of times.
A change to a parameter does Some communication-related parameters do not take effect until the Chapter 7
not take effect. inverter is reset. To make them take effect, turn the inverter off tem-
porarily, then turn it back on.
The setting of a parameter was When using the TOSHIBA Inverter Protocol, use the W command to Section 4.2
changed, but it returns to its write data into the EEPROM. If you use the P command that writes
original setting when the inverter data into the RAM only, the data will be cleared when the inverters are
is turned off. reset.

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Appendix 5 Connecting for RS485 communication

◼ Connector diagram for 2-wire RS485 communication

Pin-8 Pin-1

Signal name Pin number Description

RXD+/TXD+ 4 Same phase reception data (positive line)
RXD-/TXD- 5 Anti-phase reception data (negative line)
FWE 6 FEW (Do not connect the cable.)
SG 8 Ground line of signal data
(3)
PRG(TX) 2 PRG (Do not connect the cable.)
PRG(RX) 1 PRG (Do not connect the cable.)
P11 7 11V (Do not connect the cable.)

◼ Connecting diagram for 2-wire RS485 communication example

* Never use pin-7 (P11).

Straight Straight Straight

P5 Master Slave Slave Slave
CN1 120
510
Pin-4
RXD+/TXD+ RXD+/TXD+ RXD+/TXD+ RXD+/TXD+
120
Pin-5 RXD-/TXD- RXD-/TXD- RXD-/TXD- RXD-/TXD-
510

Pin-8 SG SG
SG SG
(Pin-3)
Terminating resistance
Pull-up/Pull-down resistance 120Ω-1/2W
120/510Ω-1/2w

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 E6581315

◼ Connector diagram for 4-wire RS485 communication

Pin-8 Pin-1

Signal name Pin number Description

RXA 4 Same phase reception data (positive line)
RXB 5 Anti-phase reception data (negative line)
TXA 3 Same phase transmitting data (positive line)
TXB 6 Anti-phase transmitting data (negative line)
SG 8 Ground line of signal data
(2)
－ 1 Open (Do not connect the cable.)
P11 7 11V (Do not connect the cable.)
*This table shows signal line of inverter side. (Example: RXA signal is received by
inverter.)

◼ Connecting diagram for 4-wire RS485 communication

Cross Straight Straight

Master Slave Slave Slave

CN1
Pin-4 RXA RXA RXA RXA

Pin-5 RXB RXB RXB RXB

Pin-3 TXA TXA TXA TXA

Pin-6 TXB TXB TXB TXB

Pin-8 SG SG SG SG
(Pin-2)
Terminating resistance
120Ω-1/2W

* When using 2-wire type, short RXB to TXB and RXA to TXA.
* Never use pin-1 (Open) and pin-7 (P11).

74E
 E6581315

Appendix 6 Inverter capacity code (FB05)

Inverter capacity code

Type and Form Voltage / Capacity (FB05)
Hexadecimal Decimal
VFAS1-2004PL Three-phase 200V 0.4kw 2 2
VFAS1-2007PL Three-phase 200V 0.75kw 4 4
VFAS1-2015PL Three-phase 200V 1.5kw 6 6
VFAS1-2022PL Three-phase 200V 2.2kw 7 7
VFAS1-2037PL Three-phase 200V 3.7kw 9 9
VFAS1-2055PL Three-phase 200V 5.5kw A 10
VFAS1-2075PL Three-phase 200V 7.5kw Ｂ 11
VFAS1-2110PM Three-phase 200V 11kw 6C 108
VFAS1-2150PM Three-phase 200V 15kw 6D 109
VFAS1-2185PM Three-phase 200V 18.5kw 6E 110
VFAS1-2220PM Three-phase 200V 22kw 6F 111
VFAS1-2300PM Three-phase 200V 30kw 70 112
VFAS1-2370PM Three-phase 200V 37kw 71 113
VFAS1-2450PM Three-phase 200V 45kw 72 114
VFAS1-2550P Three-phase 200V 55kw 73 115
VFAS1-2750P Three-phase 200V 75kw 74 116
--- Three-phase 400/460V 0.4kw --- ---
VFAS1-4007PL Three-phase 400/460V 0.75kw 24 36
VFAS1-4015PL Three-phase 400/460V 1.5kw 26 38
VFAS1-4022PL Three-phase 400/460V 2.2kw 27 39
VFAS1-4037PL Three-phase 400/460V 3.7kw 29 41
VFAS1-4055PL Three-phase 400/460V 5.5kw 2A 42
VFAS1-4075PL Three-phase 400/460V 7.5kw 2B 43
VFAS1-4110PL Three-phase 400/460V 11kw 2C 44
VFAS1-4150PL Three-phase 400/460V 15kw 2D 45
VFAS1-4185PL Three-phase 400/460V 18.5kw 2E 46
VFAS1-4220PL Three-phase 400/460V 22kw 2F 47
VFAS1-4300PL Three-phase 400/460V 30kw 30 48
VFAS1-4370PL Three-phase 400/460V 37kw 31 49
VFAS1-4450PL Three-phase 400/460V 45kw 32 50
VFAS1-4550PL Three-phase 400/460V 55kw 33 51
VFAS1-4750PL Three-phase 400/460V 75kw 34 52
VFAS1-4900PC Three-phase 400/460V 90kw 35 53
VFAS1-4110KPC Three-phase 400/460V 110kw 36 54
VFAS1-4132KPC Three-phase 400/460V 132kw 37 55
VFAS1-4160KPC Three-phase 400/460V 160kw 38 56
VFAS1-4200KPC Three-phase 400/460V 200kw 39 57
VFAS1-4220KPC Three-phase 400/460V 220kw 3A 58
VFAS1-4280KPC Three-phase 400/460V 280kw 3C 60
VFAS1-4355KPC Three-phase 400/460V 355kw 3E 62
VFAS1-4400KPC Three-phase 400/460V 400kw 3F 63
VFAS1-4500KPC Three-phase 400/460V 500kw 40 64

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©Toshiba Schneider Inverter Corporation 2005