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24.2
Bistable Function Blocks (Reset Priority)
RS(_E)
These function blocks judge two input values and output 1 (TRUE) or 0 (FALSE).
Ladder diagram
[Without EN/ENO]
s1
d
s2
Setting data
■Descriptions, types, and data types
Argument
EN
s1
s2
ENO
d
Processing details
■Operation processing
• When (s1) turns ON, (d) is set. When (s2) is turned ON, (d) is reset.
• If (s1) is turned ON when (s2) is ON, (d) is not reset.
■Operation result
1.
Function block without EN/ENO
The operation processing is executed. The operation output value is output from (d).
• Timing chart
ON
(s1)
OFF
ON
(s2)
OFF
OFF
ON
(d)
OFF
When (s1) is on
and (s2) is off,
(d) turns on.
24 BISTABLE FUNCTION BLOCKS
842
24.2 Bistable Function Blocks (Reset Priority)
[With EN/ENO]
EN
ENO
s1
d
s2
Description
Execution condition (TRUE: Execution, FALSE: Stop)
Set instruction
Reset instruction
Output status (TRUE: Normal, FALSE: Abnormal)
Output
ON
ON
ON
ON
ON
OFF
ON
ON
OFF
OFF
OFF
When (s2) is on,
(d) turns off.
Structured text
[Without EN/ENO]
RS_1(S:=s1,R1:=s2,Q1:=d);
[With EN/ENO]
RS_E_1(EN:=EN, ENO:=ENO S:=s1,R1:=s2,Q1:=d);
ON
ON
ON
ON
ON
OFF
OFF
ON
ON
OFF
OFF
Type
Data type
Input variable
BOOL
Input variable
BOOL
Input variable
BOOL
Output variable
BOOL
Output variable
BOOL
ON
ON
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