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GW-7553 Example For SIMATIC STEP 7: (Modbus TCP Slave)

GW-7553 is a PROFIBUS slave and Modbus slave device that can be used as an example in SIMATIC STEP 7. The document provides 4 examples of using GW-7553 with STEP 7 to receive and send data between a Modbus TCP master and PLC inputs/outputs over Ethernet. The examples cover receiving analog output data, digital output data, refreshing digital input data, and refreshing analog input data from the Modbus master to the PLC.

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Faiz Ul Hassan
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290 views44 pages

GW-7553 Example For SIMATIC STEP 7: (Modbus TCP Slave)

GW-7553 is a PROFIBUS slave and Modbus slave device that can be used as an example in SIMATIC STEP 7. The document provides 4 examples of using GW-7553 with STEP 7 to receive and send data between a Modbus TCP master and PLC inputs/outputs over Ethernet. The examples cover receiving analog output data, digital output data, refreshing digital input data, and refreshing analog input data from the Modbus master to the PLC.

Uploaded by

Faiz Ul Hassan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 44

GW-7553 (Modbus TCP Slave)

example for SIMATIC STEP 7

System Architecture: GW-7553 is a PROFIBUS slave and Modbus slave device.

GW-7553

1
Directory

Example 1:Receives AO data from Modbus master.

Example 2: Rceives DO data from Modbus master.

Example 3: Rereshes DI data to Modbus master.

Example 4: Rereshes AI data to Modbus master.

2
Example 1: PLC receives AO data from Modbus master.

SIMATIC STEP 7 Edit


1. HW Config. – configure GW-7553 (ex: System setting module x1, Input Register—2 word module x1)

2. HW Config – Parameter assignment (ex: Com port settings, Modbus type: Slave, Modbus format:
TCP, Byte Order: Big Endian). Confirm the GW-7553’s Com Port setting is the same with MBTCP tool
(ex: baud rate-115200, data bits-8, stop bits-1, parity-none). About the MBTCP tool, please refer to the
“Communication test” in the below.

Double Click

3
3. Save and Compile

4. Download setting into STEP 7

4
5.Insert a new Organization Block (OB1,OB82,OB86)

5
Double Click

6.S7 program edit

Variables used in the example LD Program:

6
7. S7 program download

Setup IP of GW-7553 with Utility (the user can download the latest Utility at
ftp://ftp.icpdas.com/pub/cd/fieldbus_cd/profibus/gateway/gw-7553/utilities/
1. Before the connection, please make sure the RUN LED of the GW-7553 is on and the
switch of the GW-7553 is at setting mode.

7
2. Set the Com Port Setting of the Utility

3.Click connect.

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4. Connection success

5. Click IP setting→Load from device to show IP setting dialog

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6. Set the IP of the Modbus TCP Slave and click “Save to Device” button
to save the settings.

7.Set the switch of the GW-7553 to Normal Mode then reset the power of
GW-7553.

10
Communication test
1. Confirm the GW-7553’s Com Port setting is the same with Modbus Master tool (ex: MBTCP, you
can download MBTCP from http://ftp.icpdas.com.tw/pub/cd/8000cd/napdos/modbus/modbus_utility/)
2. Send command 01 10 00 00 00 02 04 F9 F9 F9 F9 write two byte AO
3. Response value 01 10 00 00 00 02

4. PLC will receives the “AO Value (0xF9, 0xF9, 0xF9, 0xF9)” at PLC address PIW256, PIW257,
PIW258, PIW259

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Example 2: PLC receives DO data from Modbus master.

SIMATIC STEP 7 Edit


1. HW Config. – configure GW-7553 (ex: System setting module x1, Input Relay/Coil – 2 byte module
x1)

2. HW Config – Parameter assignment (ex: Com port settings, Modbus type: Slave, Modbus format:
TCP, Byte Order: Big Endian). Confirm the GW-7553’s Com Port setting is the same with MBTCP tool
(ex: baud rate-115200, data bits-8, stop bits-1, parity-none). About the MBTCP tool, please refer to the
“Communication test” in the below.

Double Click

12
3. Save and Compile

4. Download setting into STEP 7

13
5.Insert a new Organization Block (OB1,OB82,OB86)

14
Double Click

6. S7 program edit

Variables used in the example LD Program:

15
7. S7 program download

Setup IP of GW-7553 with Utility (the user can download the latest Utility at
ftp://ftp.icpdas.com/pub/cd/fieldbus_cd/profibus/gateway/gw-7553/utilities/
1. Before the connection, please make sure the RUN LED of the GW-7553 is on and the
switch of the GW-7553 is at setting mode.

16
2. Set the Com Port Setting of the Utility

3.Click connect.

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4. Connection success

5. Click IP setting→Load from device to show IP setting dialog

18
6. Set the IP of the Modbus TCP Slave and click “Save to Device” button
to save the settings.

7.Set the switch of the GW-7553 to Normal Mode then reset the power of
GW-7553.

19
Communication test
1. Confirm the GW-7553’s Com Port setting is the same with Modbus Master tool (ex: MBTCP, you
can download MBTCP from http://ftp.icpdas.com.tw/pub/cd/8000cd/napdos/modbus/modbus_utility/)

2. Send command 01 0F 00 00 00 10 02 22 33 write two byte DO


3. Response value 01 0F 00 00 00 10

4. PLC will receives the “DO Value (0x22, 0x33)” at PLC address IB6&IB7.

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Example 3: PLC refreshes DI data to Modbus master.

SIMATIC STEP 7 Edit


1.HW Config. – configure GW-7553 (ex: System setting module x1, Output Relay/Coil—2 byte module
x1)

2. HW Config – Parameter assignment (ex: Com port settings, Modbus type: Slave, Modbus format:
TCP, Byte Order: Big Endian). Confirm the GW-7553’s Com Port setting is the same with MBTCP tool
(ex: baud rate-115200, data bits-8, stop bits-1, parity-none). About the MBTCP tool, please refer to the
“Communication test” in the below.

Double Click

21
3. Save and Compile

4. Download setting into STEP 7

22
5.Insert a new Organization Block (OB1,OB82,OB86)

23
Double Click

6.S7 program edit

Variables used in the example LD Program:

24
Using T2 trigger T1 .C1 and Tri will add 1 every 1s.

25
If Tri is equal to 256, reset counter (C1)

7. S7 program download

26
Setup IP of GW-7553 with Utility (the user can download the latest Utility at
ftp://ftp.icpdas.com/pub/cd/fieldbus_cd/profibus/gateway/gw-7553/utilities/
1. Before the connection, please make sure the RUN LED of the GW-7553 is on and the
switch of the GW-7553 is at setting mode.

2. Set the Com Port Setting of the Utility

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3.Click connect.

4. Connection success

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5. Click IP setting→Load from device to show IP setting dialog

6. Set the IP of the Modbus TCP Slave and click “Save to Device” button
to save the settings.

29
7.Set the switch of the GW-7553 to Normal Mode then reset the power of GW-7553.

Communication test
1. Confirm the GW-7553’s Com Port setting is the same with Modbus Master tool (ex: MBTCP, you
can download MBTCP from http://ftp.icpdas.com.tw/pub/cd/8000cd/napdos/modbus/modbus_utility/)

30
2. Input command (” 01 02 00 00 00 10”) in MBTCP and click <Send Command> button to send
Modbus command: “01 02 00 00 00 10”. We can get the DI value (0x6F, 0xDE) from the
response message

3. We change QB3 to 0xFE and QB4 to 0xDC, and then we can click <Send Command>
button to read DI again at MBTCP and we will get the new DI value (0xFE, 0xDC) from the
response message.

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Example 4: PLC refreshes AI data to Modbus master.

SIMATIC STEP 7 Edit


1.HW Config. – configure GW-7553 (ex: System setting module x1, Output Register—2 word module
x1)

2. HW Config – Parameter assignment (ex: Com port settings, Modbus type: Slave, Modbus format:
TCP, Byte Order: Big Endian). Confirm the GW-7553’s Com Port setting is the same with MBTCP tool
(ex: baud rate-115200, data bits-8, stop bits-1, parity-none). About the MBTCP tool, please refer to the
“Communication test” in the below.

33
3. Save and Compile

4. Download setting into STEP 7

34
5.Insert a new Organization Block (OB1,OB82,OB86)

35
Double Click

6.S7 program edit

Variables used in the example LD Program:

36
37
7. S7 program download

38
Setup IP of GW-7553 with Utility (the user can download the latest Utility at
ftp://ftp.icpdas.com/pub/cd/fieldbus_cd/profibus/gateway/gw-7553/utilities/
1. Before the connection, please make sure the RUN LED of the GW-7553 is on and the
switch of the GW-7553 is at setting mode.

2. Set the Com Port Setting of the Utility

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3.Click connect.

4. Connection success

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5. Click IP setting→Load from device to show IP setting dialog

6. Set the IP of the Modbus TCP Slave and click “Save to Device” button
to save the settings.

41
7.Set the switch of the GW-7553 to Normal Mode then reset the power ofGW-7553.

Communication test
1. Confirm the GW-7553’s Com Port setting is the same with Modbus Master tool (ex: MBTCP, you
can download MBTCP from http://ftp.icpdas.com.tw/pub/cd/8000cd/napdos/modbus/modbus_utility/)

42
2. Input command (” 01 04 00 00 00 02”) in MBTCP and click <Send Command> button to send
Modbus command: “01 04 00 00 00 02”. We can get the AI value (0x006F, 0x00DE) from the
response message.

3. We change PQW256 to 0x00FE and PQW258 to 0x00DC, and then we can click <Send
Command> button to read AI again at MBTCP and we will get the new AI value (0x00FE,
0x00DC) from the response message.

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