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6F3B0250
Basic Hardware and Function
233
7. Instructions
FUN 147 F/F Flip-flop
Expression
Set input
-
S
F/F
Q
-
Output
Reset input
-
R
A
Function
When the set input is ON, the device
A
is set to ON. When the reset input is ON, the device
A
is reset
to OFF. When both the set and reset inputs are OFF, the device
A
remains the state. If both the set
and reset inputs are ON, the device
A
is reset to OFF.
The state of the output is the same as the device
A
.
Execution condition
Set
input
Reset
input
Operation Output
OFF OFF No execution (
A
remains previous state) Same
ON Resets
A
to OFF as
A
ON OFF Sets
A
to ON
ON Resets
A
to OFF
Operand
Name Device Re
g
ister Constant Index
X Y R S T. C. XW YW RW SW T C D I J K
A
Device
ÖÖÖ
Example
When X003 is ON, R10E is set to ON. When X004 is ON, R10E is reset to OFF. If both are ON,
R10E is reset to OFF.
An example timing diagram is shown below.
X003
X004
R10E
Note
·
For the set input, direct linking to a connecting point is not allowed. In this case, insert a dummy
contact (always ON = S04F, etc.) just before the input. Refer to Note of Shift register FUN 074.
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