ANSI / IEEE
IEC 60617What the OR gate symbol means
The output is 1 when at least one input is 1.
ANSI and IEC symbols
Where you see it
Digital electronics, PLC function block diagrams, interlock and safety logic, and cause and effect logic.
Related symbols
Frequently asked questions
What does the OR gate symbol look like?
On ANSI drawings: A curved shield shape with a pointed output. In IEC 60617: A rectangle marked ≥1.
Is the OR gate symbol the same in IEC and ANSI?
No. A rectangle marked ≥1.
Where is a OR gate used?
Digital electronics, PLC function block diagrams, interlock and safety logic, and cause and effect logic.
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