|Memory Ranges||ENO||Errors||Instruction Support for S7-200 CPUs||SIMATIC/International Mnemonics|
|The NOT contact changes the state of power flow input. When power flow reaches the NOT contact, it stops. When power flow does not reach the NOT contact, it supplies power flow.
In LAD, the NOT instruction is shown as a contact.
In FBD, the NOT instruction uses the graphical negation symbol with Boolean box inputs.
In STL, the NOT instruction changes the value on the top of the stack from 0 to 1, or from 1 to 0.