128 D50 PLC User's Manual
Test Precautions
When checking the system:
CAUTION: Always turn off the power whenever you install or remove a module.
1. Check the module more than one time before exchanging the part.
2. Include a complete description of the symptoms when you return a defective module for
repair.
3. When you suspect that a contact may be defective, it might only need cleaning. Clean the
contact using a clean cotton cloth and alcohol. Then retest the module.
4. Do not use thinner to clean any of the parts.
System Checks
Before installing the I/O wiring of the PLC and supplying power, check the following items.
Check the connection
of the power cable
Check the connection
of the I/O expansion
module cables
Check the grounding
Verify proper wiring of
the emergency stop
circuit
Check the power
source
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