![]() ![]() ![]() The start pushbutton can now be released because the CR contacts allow the power to pass through to the CR. The CR contact closes and ‘seals in’ the start pushbutton. When the start pushbutton (NO) is pressed the power is passed through the stop pushbutton (NC) to the control relay (CR). (Physical switches wired to outputs devices, such as motor contactors and relays.) Let’s start with the basic start stop circuit. Looking at a stop-start jog circuit in the PLC will help us in understanding the differences in hard-wiring the circuit and programming.
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