Chapter 17 Bistable Function Blocks; Bistable Function Block (Set-Dominant) - Mitsubishi Electric MELSEC iQ-R Series Programming Manual

17
BISTABLE FUNCTION BLOCKS
17.1

Bistable Function Block (Set-Dominant)

SR
These function blocks discriminate between two input values, and output 1 (TRUE) or 0 (FALSE).
Structured text
Instance name(S1:=s1,R:=s2,Q1:=d);
Setting data
■Description, type, data type
Argument
s1 (S1)
s2 (R)
d (Q1)
Processing details
■Operation processing
• When (s1) turns on, (d) is set. Turning on (s2) while (s1) is off resets (d).
• Even when (s2) turns on while (s1) is on, (d) is not reset.
■Operation result
The operation processing is performed. The operation result is output from (d).
• Timing chart
ON
(s1)
OFF OFF
(s2)
OFF
ON
(d)
OFF
(1)
(1) When (s1) turns on, (d) turns on.
(2) When (s2) turns on while (s1) is off, (d) turns off.
Operation error
There is no operation error.
17 BISTABLE FUNCTION BLOCKS
192
17.1 Bistable Function Block (Set-Dominant)
Description
Set command
Reset command
Output
ON ON
OFF OFF
ON ON ON
ON ON
OFF OFF OFF
(2)
Type
Input variable
Input variable
Output variable
ON ON
OFF OFF
ON ON
ON ON
OFF OFF
Data type
BOOL
BOOL
BOOL
ON
ON