6-3
6 Troubleshooting
CJ2 CPU Unit Hardware User’s Manual
6-1 CPU Unit Errors
6
6-1-3 Checking Detailed Status
Use the following procedure to read the error status.
1. Connect the CX-Programmer online.
2. Double-click Error Log in the project tree in the main window. The PLC Error Window will be dis-
played.
3. Click the Errors Tab. The current errors will be displayed on the Errors Tab Page.
You can check detailed error status using information registered in the Auxiliary Area. The following
error details are registered.
• Error Flags: The Auxiliary Area contains flags that indicate the type of error. There are error flags for
various types of error.
• Error Information: The Auxiliary Area contains words that provide detailed information on current
errors. Error information is provided for various types of error.
• Error Code: The error code assigned to the current error is stored in word A400 regardless of the
type of error. If two or more errors occur at the same time, the highest
(most serious) error code will be stored in A400.
If the error status could not be checked when the error occurred, it can be checked by reading error log
data. The following information is stored in the error log.
• Error code (This is the same error code as is stored in word A400.)
• Error information
• Time of occurrence
Checking Error Status with the CX-Programmer
6-1-3 Checking Detailed Status
6-1-4 Reading Error Log Information
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