Wire, Program, and Commission a Programmable Logic Relay

Wire a programmable logic relay into the control circuit of a motor starter, write the start-stop program with a seal branch, and commission it. Four explorations follow: two ways to wire the stop, why the e-stop is hardwired, a seal that follows the starter's auxiliary contact, and a final build from a clean bench.

• Wire the 120 V control side: transformer secondary, fused supply, e-stop, STOP and START inputs, and the coil loop
• Read how the relay turns input states into outputs
• Write a start-stop rung with a seal branch and transfer it with Write to PLR
• Switch the relay between STOP and RUN from its own keypad
• Use a timer and a counter in a program
• Commission the circuit: seal, stop, e-stop and a power cut in RUN