ANSI / IEEE
IEC 60617What the NOT gate symbol means
The output is the opposite of the input.
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 NOT gate symbol look like?
On ANSI drawings: A triangle with a small circle at the output. In IEC 60617: A rectangle marked 1, with a small circle at the output for the inverted output.
Is the NOT gate symbol the same in IEC and ANSI?
No. A rectangle marked 1, with a small circle at the output for the inverted output.
Where is a NOT gate used?
Digital electronics, PLC function block diagrams, interlock and safety logic, and cause and effect logic.
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