Negated coil symbol
Also called Inverted coil, NOT coil
Writes the opposite of the rung: 0 while the rung is true, 1 when it is false.
IEC 61131-3What the negated coil symbol means
Writes the opposite of the rung: 0 while the rung is true, 1 when it is false.
How it is drawn
Where you see it
Rarely needed; most programmers use a normally closed contact instead. Not available in every PLC.
Related symbols
Frequently asked questions
What does the negated coil symbol look like?
A coil with a slash inside, (/).
Where is a negated coil used?
Rarely needed; most programmers use a normally closed contact instead. Not available in every PLC.
Every interlock in your PLC logic, tested and signed.Deskely holds the cause and effect and function test records for every system, checked as they are signed, so the logic is proved before start-up.
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