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TIMER
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Objectives
- Understand The Move Function & How It Works. - Know The Types Of Timer & What Is The Difference Between Them.
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Load and Transfer
Move
MOVE
EN
ENO
Example: L +5 // 16-bit constant T MB0 L L#523123 // 32-bit constant T MD4 L B#16#EF // byte in hexadecimal form T MW8 L 2#0010 0110 1110 0011 //16-bit binary T MW10 L 3.14 // 32-bit constant T MD12
LAD Diagram
20 IN OUT MW10
MOVE EN OUT MB10
FBD Diagram
20 IN ENO
20 MB10
STL
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Timers
- ON Delay Timer (SD) - Stored ON Delay Timer (SS) - Pulse Timer (SP) LAD Diagram
I 0.0 S5T#5s I 0.1
T(No.) S_(Type) Q S
TV R BI BCD
Q0.0 MW0
- Extended Pulse Timer (SE)
- OFF Delay Timer (SF)
I 0.0 S TV R
T(No.) S_(Type) BI
BCD
MW0 Q0.0 =
FBD Diagram
S5T#5s I 0.1
STL
A I 0.0 L S5T#5s S(Type) T(No.) A I 0.1 R T(No.) L T(No.) T MW0 A T(No.) = Q0.0
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ON Delay Timer (SD)
I 0.0
T0 S_ODT S Q BI BCD TV R T0
Start
The timer starts when the Start input LAD Diagram "S" changes from "0" to "1". The timer starts with the time value specified at the Time Value "TV" for as long as the signal state at input "S" =1.
S5T#5s I 0.1
Q0.0 MW0
S_ODT
I 0.0 S5T#5s I 0.1 S TV R BI
BCD
MW0 Q0.0 =
Reset
When the Reset input "R" changes from "0" to "1", the current time value and the time base are deleted and the output "Q" is reset.
FBD Diagram
Output
The signal at the "Q" output changes to "1" when the timer has expired without error and input "S" has signal state "1".
STL
Digital Outputs
The current time value can be read as a binary number at the "BI" output and as a BCD number at the "BCD" output.
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A L SD A R L T A =
I 0.0 S5T#5s T I 0.1 T0 T0 MW0 T0 Q0.0
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Stored ON Delay Timer (SS)
Start
The stored-on-delay timer starts when the "S" input changes from "0" to "1". The timer runs starting with the time value specified at input "TV" and continues to run even if the signal at input "S" changes back to "0" during that time.
I 0.0 T1 S_ODTS Q S TV BI Q0.1 MW0
LAD Diagram
S5T#5s I 0.1
R
T1
BCD
S_ODTS
Reset
When the reset input "R" changes from "0" to "1", the current time value and the time base are deleted and output "Q" is reset.
I 0.0
S TV R
BI
BCD
MW0 Q0.1 =
FBD Diagram
S5T#5s
I 0.1
Q I 0.0 S5T#5s T1 I 0.1 T1 T1 MW0 T1 Q0.1
Output
The signal state at output "Q" changes to "1" when the timer has expired without error, regardless of whether the signal state at input "S" is still "1".
STL
A L SS A R L T A =
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Pluse Timer (SD)
Start The pulse timer starts when the "S" input changes from "0" to "1". Output "Q" is also set to "1".
I 0.0 T2 S_PULSE Q S TV R T2 BI BCD
Q0.2 MW0
LAD Diagram
S5T#5s I 0.1
Reset Output "Q" is reset when the timer has expired, or the start "S" signal changes from "1" to "0", or the reset input "R" has a signal state of "1".
I 0.0
S_PLUSE S TV R BI
BCD
MW0 Q0.2 =
FBD Diagram
S5T#5s
I 0.1
Q I 0.0 S5T#5s T2 I 0.1 T2 T2 MW0 T2 Q0.3
STL
A L SP A R L T A =
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Extended Pluse Timer (SE)
Start The extended pulse timer starts when the "S" input changes from "0" to "1". Output "Q" is also set to "1". The signal state at output "Q" remains at "1" even if the signal at the "S" input changes back to "0". If the signal at the start input changes from "0" to "1" again while the timer is running, the timer is restarted
I 0.0 T3 S_PEXT Q S TV R T3 S_PEXT I 0.0 S TV R BI
BCD
Q0.3 MW0
LAD Diagram
S5T#5s I 0.1
BI BCD
MW0 Q0.3 =
FBD Diagram
S5T#5s
I 0.1
Q I 0.0 S5T#5s T3 I 0.1 T3 T3 MW0 T3 Q0.3
Reset Output "Q" is reset when the timer has expired, or the reset input "R" has a signal state of "1".
STL
A L SS A R L T A =
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Off Delay Timer (SD)
Start The off-delay timer starts when the "S" input changes from "1" to "0". When the timer has expired, the signal state at output "Q" changes to "0". If the signal state at the "S" input changes from "0" to "1" while the timer is running, the timer stops. The next time the signal state at the "S" input changes from "1" to "0", it starts again from the beginning. Reset When the reset input "R" is "1", the current time value and the time base are deleted and output "Q" is reset. If both inputs (S and R) have signal states of "1", output "Q" is not set until the dominant reset is deactivated. Output Output "Q" is activated when the "S" input changes from "0" to "1". If input "S" is deactivated, output "Q" continues to have signal state of "1" until the programmed time has expired.
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I 0.0
T4 S_OFFDT Q S TV R T4 S_OFFDT BI BCD
Q0.4 MW0
LAD Diagram
S5T#5s I 0.1
I 0.0
S TV R
BI
BCD
MW0 Q0.4 =
FBD Diagram
S5T#5s
I 0.1
Q I 0.0 S5T#5s T4 I 0.1 T4 T4 MW0 T4 Q0.4
STL
A L SS A R L T A =
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ON Delay Timer (SD)
S R Timer
Extended Pluse Timer (SE)
S R Timer
Stored ON Delay Timer (SS)
S R Timer
Off Delay Timer (SF)
S R Timer
Pluse Timer (SP)
S R Timer Q SIMATIC S7
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Exercise:
1- By using two On Delay timer, write a PLC program to make the car flasher. 2- By using two .. timer, write a PLC program to make two Lamp flashing opposite to each other.
3- By using two Extended Pulse timer , write a PLC program to make Pulse Generator.
4- By using one Extended Pulse timer, write a PLC program to make the car flasher.
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Answer of Exercise 1:
Answer of Exercise 2:
Answer of Exercise 3:
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Answer of Exercise 4:
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