RS reset-dominant bistable symbol
Also called RS, Reset dominant latch, Flip-flop
A latch where reset wins: Q1 goes true on S and false on R1, and if both are true, Q1 is false.
IEC 61131-3What the RS reset-dominant bistable symbol means
A latch where reset wins: Q1 goes true on S and false on R1, and if both are true, Q1 is false.
How it is drawn
IEC 61131-3 ladder diagram
RS function block. A box marked RS with inputs S and R1 and output Q1.
LD SVGWhere you see it
Latches where the reset must win, such as trips and alarms that must clear on a reset.
Related symbols
Frequently asked questions
What does the RS reset-dominant bistable symbol look like?
A box marked RS with inputs S and R1 and output Q1.
Where is a RS reset-dominant bistable used?
Latches where the reset must win, such as trips and alarms that must clear on a reset.
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