And when Input ( I1) is released then coil( Q1 is off. When ( I1) is pressed then the coil ( Q1) is on. In the case of PLC ladder, there will be a push button to provide input. Logic Gate Truth Table for NOT Gate: Input (I1) When the input is high then the output is low and vice-versa. In electronics, NOT GATE is also called an ‘ Inverter’ or ‘ Buffer’.
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