Cutler-Hammer D50 - Correcting Errors; System Check

132 D50 PLC User's Manual
Correcting Errors
System Check
Refer to the system check flow chart when you encounter problems during startup and testing.
System Check Flowchart
Is PLC in Run
(RUN LED On)?
Is ERR LED
illuminated?
Are I/O modules
operating normally?
Replace the faulty module/
Correct the program
Go to the RUN
Check flowchart
Go to the Error
Check flowchart
Go to the I/O
Check flowchart
Is RUN LED
ON or Flashing?
Go to the Power Supply
Check flowchart
No
No
Yes
No
Yes
Yes
No
Yes
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