Bistable Function Block (Reset-Dominant) - Mitsubishi Electric MELSEC iQ-R Series Programming Manual

17.2

Bistable Function Block (Reset-Dominant)

RS
These function blocks discriminate between two input values, and output 1 (TRUE) or 0 (FALSE).
Structured text
Instance name(S:=s1,R1:=s2,Q1:=d);
Setting data
■Description, type, data type
Argument Description
s1 (S) Set command
s2 (R1) Reset command
d (Q1) Output
Processing details
■Operation processing
• When (s1) turns on, (d) is set. When (s2) turns on, (d) is reset.
• Even when (s1) turns on while (s2) is on, (d) is not reset.
■Operation result
The operation processing is performed. The operation result is output from (d).
• Timing chart
ON ON
(s1)
OFF
ON ON
(s2)
OFF OFF
ON ON
(d)
OFF OFF
(1) (2)
(1) When (s2) turns off while (s1) is on, (d) turns on.
(2) When (s2) turns on, (d) turns off.
Operation error
There is no operation error.
ON ON
ON ON ON
OFF
ON
OFF OFF
Type
Input variable
Input variable
Output variable
ON ON
ON ON
OFF OFF
ON ON ON
OFF OFF
17 BISTABLE FUNCTION BLOCKS
17.2 Bistable Function Block (Reset-Dominant)
17
Data type
BOOL
BOOL
BOOL
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