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Troubleshooting Flowcharts Section 5-5
5-5 Troubleshooting Flowcharts
Use the following flowcharts to troubleshoot errors that occur during opera-
tion.
Main Check
Operation stopped. Check for fatal errors.
Check for non-fatal errors.
Error
Replace the CPU
Unit.
PWR indicator lit?
RUN indicator lit?
ERR/ALM indicator
flashing?
Is I/O sequence
normal?
Operating
environment normal?
Check I/O.
Check operating environment.
Ye s
Check power supply.
No
No
No
No
Flashing
Ye s
Ye s
Not lit
Ye s
(See page 201.)
(See page 202.)
(See page 203.)
(See page 204.)
(See page 206.)
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