What you'll learn
In this lab you wire an **emergency-stop control circuit**: an E-stop in series with a relay coil, so pressing the E-stop drops the relay. The panel's power rail is already wired for you: the 24 VDC supply feeds the PLC and the Ethernet switch, the +24 V and 0 V strips are loaded, and the supply's protective earth is bonded to the ground bar. (**Wiring 1A: Power the PLC** teaches how to wire it.) The pre-wired conductors are greyed out and cannot be changed.
- Wire the E-stop (channel 1, normally closed) in series with the relay coil, between
Lab time: ~8 minutes.
Lesson briefing
E-Stop Control Circuit
In this lab you wire an emergency-stop control circuit: an E-stop in series with a relay coil, so pressing the E-stop drops the relay. The panel's power rail is already wired for you: the 24 VDC supply feeds the PLC and the Ethernet switch, the +24 V and 0 V strips are loaded, and the supply's protective earth is bonded to the ground bar. (Wiring 1A: Power the PLC teaches how to wire it.) The pre-wired conductors are greyed out and cannot be changed.
Goals:
- Wire the E-stop (channel 1, normally closed) in series with the relay coil, between the +24 V strip and the 0 V strip, so the coil is energised until the E-stop is pressed.
- Fit a flyback diode across the coil, so the coil's voltage spike when it switches off cannot damage the contacts or the supply.
Tip: use red wire for +24 V and blue for 0 V. Any free slot on a strip works: all the slots of a strip are one bus. Switch on Guided wiring in the right-hand panel at any time to be walked through each connection.
Hints
Follow the current: it leaves the +24 V strip, passes through a normally closed contact, energises the coil, and returns to the 0 V strip. Contacts that are normally closed pass current until they are pressed.
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This lesson uses 10 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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