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Free PLC troubleshooting exercises
Read the print, take the operator's complaint, and find the fault with a virtual multimeter — the same way you would at a real panel. Every reading comes from a live circuit, so the meter never lies.
- 1
Read the complaint
What the operator says on the radio.
- 2
Probe the circuit
Place red and black leads, press buttons, read volts.
- 3
Name the faulted device
Submit your diagnosis and see the root cause.
Conveyor 2 won't start
Operator: 'I press start on Conveyor 2 and absolutely nothing happens. No light, no hum, nothing.'
24VDC control circuit: fused control power feeds an E-stop, a normally closed stop button, a start button, an overload contact and the M2 contactor coil.
01 Land probes on two wire numbers.
02 Operate field devices on the print.
03 Green is energized; amber is open.
04 Prove the fault before submitting.
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