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Section
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Troubleshooting Flowcharts
Use the following flowcharts to troubleshoot errors that occur during operation.
Main Check
Check for non-fatal errors. (See page 131.)
Error
Replace the CPU
Unit.
PWR indicator lit?
RUN indicator lit?
ERR/ALM indicator
flashing?
Is I/O sequence
normal?
Operating
environment normal?
Operation stopped. Check for fatal errors.
(See page 130.)
Check I/O. (See page 132.)
Check operating environment. (See page 134.)
Yes
Check power supply. (See page 129.)
No
No
No
No
Flashing
Yes
Yes
Not lit
Yes
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