Positive transition contact symbol
Also called Rising edge contact, P contact, One shot rising
Passes power for one scan when its bit changes from 0 to 1.
IEC 61131-3What the positive transition contact symbol means
Passes power for one scan when its bit changes from 0 to 1.
How it is drawn
Where you see it
Acting once on a button press or a new event, such as counting a part or starting a sequence step.
Related symbols
Frequently asked questions
What does the positive transition contact symbol look like?
A contact marked P.
Where is a positive transition contact used?
Acting once on a button press or a new event, such as counting a part or starting a sequence step.
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