3.4 ST↑, ST↓ (Leading and Trailing Contact Instructions)
■
Ladder diagram
ST
R0
Y110
■
Devices that can be specified (indicated by ●)
Operand
Bit device
Specification of bit of
word device
Index modifier
X
Y
R
L
T
C
P
E
SR IN OT
DT.n
LD.n
bit
●
●
●
●
●
●
●
●
●
●
●
●
●
■
Outline of operation
Type of
instruction
Operation
ST↑
Conduction takes place for 1 scan only following the change of a signal from the OFF to ON state
(rise).
Begins a logic operation by treating the input contact as a Form A (normally open) or Form B
(normally closed).
ST↓
Conduction takes place for 1 scan only following the change of a signal from the ON to OFF state
(fall).
Begins a logic operation by treating the input contact as a Form A (normally open) or Form B
(normally closed).
■
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
⇔
1 scan
3.4 ST↑, ST↓ (Leading and Trailing Contact Instructions)
3-8
WUME-FP7CPUPGR-12
Summary of Contents for FP7 Series
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