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7-4SectionTroubleshooting Flowcharts
118
7-4 Troubleshooting Flowcharts
Use the following flowcharts to troubleshoot errors that occur during operation.
Main Check
Check for non-fatal errors. (See page 121.)
Error
Replace the CPU
Board.
PWR indicator lit?
RUN indicator lit?
ERR indicator
flashing?
Is I/O sequence
normal?
Operating
environment normal?
Operation stopped. Check for fatal errors.
(See page 120.)
Check I/O. (See page 122.)
Check operating environment. (See page 124.)
Yes
Check power supply. (See page 119.)
No
No
No
No
Flashing
Yes
Yes
Not lit
Yes