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High−level Instructions
F374
(DDTR)
P374
(PDDTR)
Outline
This instruction detects changes in 32-bit data values.
Program example
Trigger
R0
10
F374 DDTR, DT10, DT20
Trigger
R0
R9009
17
S
D
Operands
Relay
Operand
Operand
WX WY WR WL
S
A
A
D
N/A
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.
3 − 778
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32-bit data revision detection
Ladder Diagram
Ladder Diagram
S
Lower 16-bit area of 32-bit data for detecting data changes.
Lower 16-bit area of 32-bit data where data of previous execution is stored.
Timer/Counter
SV
EV
A
A
A
A
A
A
A
A
D
R10
Index
Register
register
DT
LD
FL
I
A
A
A
A
A
A
A
A
Boolean
Address
Instruction
10
ST
R
11
F374
DT
DT
17
ST
R
18
AN
20
OT
R
Constant
Index
modifier device
modifier
K
H
f
N/A N/A N/A
A
N/A N/A N/A
A
A:
Available
N/A: Not Available
0
(DDTR)
10
20
0
R9009
10
Integer
device
N/A
N/A
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