What you'll learn
In this lesson you will wire a 24 VDC DIN-rail power supply to the PLC base unit and establish a solid earth ground through the ground bar.
- Connect the AC mains (L, N, PE) to the power supply input terminals.
- Route the 24 VDC and 0 VDC output rails from the PSU to the PLC power terminals.
- Bond every PE/ground terminal to the ground bar.
- Wire the E-stop button into the control circuit via the relay and contactor.
Lab time: ~15 minutes.
Lesson briefing
24 VDC Power Supply & Grounding
In this lesson you will wire a 24 VDC DIN-rail power supply to the PLC base unit and establish a solid earth ground through the ground bar.
Goals:
- Connect the AC mains (L, N, PE) to the power supply input terminals.
- Route the 24 VDC and 0 VDC output rails from the PSU to the PLC power terminals.
- Bond every PE/ground terminal to the ground bar.
- Wire the E-stop button into the control circuit via the relay and contactor.
Tip: use black wire for 0 V / neutral, red for 24 VDC, and green-yellow for all protective-earth connections.
Hints
Start with the protective-earth (PE) connections — green-yellow wire from PSU PE to the ground bar.
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This lesson uses 12 placed components on the lab canvas. Components are vendor-neutral (no proprietary trademarks); the wiring rules apply to any equivalent industrial part.
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