Chapter 7: Testing and Troubleshooting
177
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
Power supply LED will not illuminate.
Blown fuse
Replace the fuse.
Power supply fuse blows frequently.
Short circuit/
Defective part
Replace the power supply.
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
Replace the backplane.
Not all points on an I/O module operate properly.
I/O bus error
Replace the backplane.
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