St↑, St↓ (Leading And Trailing Contact Instructions) - Panasonic FP7 Series Command Reference Manual

3.4 ST↑, ST↓ (Leading and Trailing Contact Instructions)
3.4 ST↑, ST↓ (Leading and Trailing Contact Instructions)
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Ladder diagram
ST
R0
■
Devices that can be specified (indicated by ●)
Operand
X Y
bit ●
■
Outline of operation
Type of Operation
instruction
Conduction takes place for 1 scan only following the change of a signal from the OFF to ON state
(rise).
ST↑
Begins a logic operation by treating the input contact as a Form A (normally open) or Form B
(normally closed).
Conduction takes place for 1 scan only following the change of a signal from the ON to OFF state
(fall).
ST↓
Begins a logic operation by treating the input contact as a Form A (normally open) or Form B
(normally closed).
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Operation Example
Program operation of "ST↑" in the ladder diagram
When R0 changes from OFF to ON (rise), only 1 scan is output to Y110.
R0
Y110
⇔ 1 scan
3-8
Bit device
R L T C
● ● ● ● ●
P E SR IN OT
● ● ● ● ●
⇔ 1 scan
Y110
Specification of bit of
word device
DT.n LD.n
● ●
WUME-FP7CPUPGR-12
Index modifier