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Diagnostic Functions Section 6-7

6-7 Diagnostic Functions

This section provides a brief overview of the following diagnostic and debug-

ging functions.

• Error Log

• Output OFF Function

• Failure Alarm Functions (FAL(006) and FALS(007))

• Failure Point Detection (FPD(269)) Function

6-7-1 Error Log

Each time that an error occurs in a CS/CJ-series PLC, the CPU Unit stores

error information in the Error Log Area. The error information includes the

error code (stored in A400), error contents, and time that the error occurred.

Up to 20 records can be stored in the Error Log.

In addition to system-generated errors, the PLC records user-defined

FAL(006) and FALS(007) errors, making it easier to track the operating status

of the system.

Refer to the section on troubleshooting in the CS/CJ Series Operation Manual

for details.

Note A user-defined error is generated when FAL(006) or FALS(007) is executed in

the program. The execution conditions of these instructions constitute the

user-defined error conditions. FAL(006) generates a non-fatal error and

FALS(007) generates a fatal error that stops program execution.

When more than 20 errors occur, the oldest error data (in A100 to A104) is

deleted, the remaining 19 records are shifted down by one record, and the

newest record is stored in A195 to A199.

Omron SYSMAC CS/CJ Series User Manual

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