SR

The SR function block is bistable and SET is dominant.

Q1 = SR (SET1, RESET)

I.e.: Q1 = (NOT RESET AND Q1) OR SET1Q1, SET1 and RESET are BOOL variables.

Inputs

VAR_INPUT
    SET1  : BOOL;
    RESET : BOOL;
END_VAR

Name	Type	Description
SET1	BOOL	Set input (dominant) - Q1 is set to TRUE on a rising edge
RESET	BOOL	Reset input - Q1 is set to FALSE on a rising edge

VAR_OUTPUT
    Q1 : BOOL;
END_VAR

Name	Type	Description
Q1	BOOL	Output

Internal implementation of the function block:

Q1 := (NOT RESET AND Q1) OR SET1;

Development environment	Target platform	PLC library to include
TwinCAT v3.0.0	PC or CX (x86)	Tc2_Standard