138 D50 PLC User's Manual
Troubleshooting, Maintenance and Inspection Tables
The following tables list some common problems and troubleshooting procedures for the PLC system
in the event of faulty operation. Additionally, a table is provided which covers the routine maintenance
procedures to be followed to ensure long life of the PLC system with minimum downtime and
maintenance cost.
System Operation
Symptom Expected Cause Troubleshooting
Program errors Correct the program.Run LED will not illuminate.
Power line defect Replace the CPU module.
Output will not turn to On state during Run. Short or open circuit Replace the CPU module.
I/O Modules above a certain address will not operate. I/O bus error Check I/O expander cable.
Not all points on an I/O module operate properly. I/O bus error Check I/O expander cable.
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