Chapter 7: Testing and Troubleshooting 129
Item What to Check
The connection of the power
cable and the I/O expansion
cables.
• Check that the wiring is secure and intact.
• Check that the terminal screws are tightly fastened.
• Check that I/O module is firmly fixed.
• Check that the power cable connection is secure.
• Check that the cable size is correct.
Grounding • Check that the grounding is triple grounded and
separate from other device grounds.
Emergency stop circuit • Check that the emergency stop circuit for problems
external to the PLC is wired accurately, and will
IMMEDIATELY disconnect power on demand.
Power source • Check that the power and voltage sources are within
specifications.
For 110/220 VAC (85 to 264 VAC)
For 24 VDC (20 to 28 VAC)
• Check that the voltage to AC-type I/O is within
specifications.
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