Negative transition contact symbol
Also called Falling edge contact, N contact, One shot falling
Passes power for one scan when its bit changes from 1 to 0.
IEC 61131-3What the negative transition contact symbol means
Passes power for one scan when its bit changes from 1 to 0.
How it is drawn
Where you see it
Acting once when something stops or is released, such as a motor stopping or a button let go.
Related symbols
Frequently asked questions
What does the negative transition contact symbol look like?
A contact marked N.
Where is a negative transition contact used?
Acting once when something stops or is released, such as a motor stopping or a button let go.
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