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You can see that the diagram will work the exact same as the circuit above with the start and stop pushbuttons. Jog Hard Wire DiagramĪdding a jog input to the hard-wiring diagram will look something like this: Letting go of the stop pushbutton will return us back to the original state shown above. Pressing the stop pushbutton will break the circuit and turn off CR. Letting go of the start pushbutton, the output remains on because of the CR input seals in the start pushbutton. If we hit the start pushbutton then the circuit is complete and the output CR turns on. You can see that the stop input is currently on in the program. This is because the actual signal wired in the input is NC and we do not want to inverse this signal. The first thing that you will notice is that the input for Stop is NO contact and not NC. Let’s take a look at the PLC program for the above wiring diagram. NC – Normally Closed – This refers to the state of the input device if nothing acts upon it. NO – Normally Open – This refers to the state of the input device if nothing acts upon it. 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.