11TROUBLESHOOTING

11.3 Error Code List

MELSEC-Q

If a fault occurs when the PLC power supply is switched on, when the CPU is switched from STOP to RUN or during RUN, the High Performance model QCPU displays an error (on the LED) using the self-diagnostic function and stores the error information into the special relays SM and special registers SD.

REMARK

For the error code (4000H to 4FFFH) developed upon a request for general data processing from the GX Developer, intelligent function module or network system, refer to Appendix 1.

11.3.1 Procedure for reading error codes

When an error occurs, the error code and error message can be read by the GX

Developer Version 4 or later.

The procedure for reading error codes by the GX Developer is as follows.

1)Start the GX Developer.

2)Connect the CPU module to the personal computer.

3)Select [Online] - [Read from PLC] Menu by the GX Developer, and also read the project from the High Performance model QCPU.

4)Select the [Diagnostics] - [Diagnostics PLC] Menu.

5)Click the "Error Jump" button in the PLC diagnostics dialog box to display the error code and error message.

6)Select the [Help] - [PLC error] Menu, and confirm the content of the applicable error code.

For details of the GX Developer operating method, refer to the applicable the GX

Developer Operating Manual.

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