Cpu Errors - Omron CP1H CPU Operation Manual

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Troubleshooting

11-2-4 CPU Errors

11-2-5 Non-fatal Errors

■ CPU Unit Indicators

A CPU error or fatal error may have occurred if the ERR/ALM indicator lights

during operation (RUN mode or MONITOR mode), the RUN indicator turns

OFF, and operation stops. A CPU error may have occurred if nothing is shown

on the 7-segment display or the same message remains on the display.

Seven-segment

The display is not

lit or it is frozen.

■ Reference Information

Error code (A400)

Error information

Note Just as when a CPU error occurs, the RUN indicator will turn OFF and the

ERR/ALM indicator will light when a fatal error occurs. Connecting the CX-

Programmer, however, is possible for fatal errors but not for CPU errors. If the

CX-Programmer cannot be connected (online), a CPU error has probably

A non-fatal error has occurred if both the RUN indicator and the ERR/ALM

indicator are lit during operation (i.e., in RUN or MONITOR mode).

■ CPU Unit Indicators

Information on the non-fatal error can be obtained from the error code on the

7-segment display and from the Error Tab Page of the CX-Programmer's PLC

Error Window. Take corrective actions after checking error details using the

display messages and the Auxiliary Area Error Flags and error information.

• Errors are listed in the following table in order, with the most serious ones

• If two or more errors occur at the same time, the most serious error code

will be stored in A400.

Probable cause and possible remedy

A WDT (watchdog) error occurred in the CPU Unit. (This does

not occur in normal use.) Cycle the power supply. The Unit may

be faulty. Consult your OMRON representative.

Section 11-2

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