User Manual

High−level Instructions
3 − 778
Outline This instruction detects changes in 32-bit data values.
Program example
Ladder
Diagram
Boolean
Ladder Diagram
Address Instruction
S
Trigger
D
F374 DDTR, DT10, DT20
10
R0
17
R0 R10
R9009
Trigger
10
11
17
18
20
ST R 0
F374 (DDTR)
DT 10
DT 20
ST R 0
AN R9009
OT R 10
S Lower 16-bit area of 32-bit data for detecting data changes.
D Lower 16-bit area of 32-bit data where data of previous execution is stored.
Operands
O
p
erand
Relay Timer/Counter Register
Index
register
Constant
Index
modifier
Integer
device
Operand
WX WY WR WL SV EV DT LD FL I K H f
modifier device
S A A A A A A A A A A N/A N/A N/A A N/A
D N/A A A A A A A A A A N/A N/A N/A A N/A
Explanation of example
When the trigger R0 turns on, R9009 will turn on if there has been a change in data register DT10 since the
previous execution. Following this, the internal relay R10 will also turn on.
Description
If the data in the 32-bit area specified by S has changed since the previous execution, internal relay R9009
(carry flag) will turn on.
D+1 and D is used to store the data of the previous execution, and when the current execution has been
completed, the current data is stored in D+1 and D.
F374
P374
(PDDTR)
(DDTR)
32-bit data revision detection
A
:
A
vailable
N/A: Not Available