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11 - 1

TROUBLESHOOTING

11

11 - 1

11

MELSEC-F

11 TROUBLESHOOTING

This section explains the contents of the errors that may occur during communication 
between the Ethernet module and an external device as well as the troubleshooting 
procedures.
The following are methods for checking if there is an error on the Ethernet module 
side and the contents of the error. 
Use one of the following methods to check if there is an error and its content, then 
take corrective actions. 

(1) Check using the display LED on the front of the Ethernet module 

(See Section 11.1.)

The display LED on/off status can be used to check if an error is occurring in the 
Ethernet module.

(2) Check through FX Configurator-EN-L

FX Configurator-EN-L can be used to check various conditions of the Ethernet 
module as well as the error code corresponding to the contents of the error 
occurring and to perform tests. 

(a) Ethernet diagnostics (See Subsection 11.2.2.)

1) PING test (See Subsection 5.4.1.)
2) COM. ERR off (See Subsections 11.1.2 and 11.2.1.)

(3) Check through GX Developer

(a) Buffer memory batch monitor

The error code can be checked by monitoring the buffer memory of the 
Ethernet module.

(4) Check the contents of the error using the error code (See Section 

11.4.)

The contents of the error can be checked using the error code confirmed on the 
dedicated screen above or by monitoring the buffer memory by referring to 
Section 11.4.

NOTE

If line errors and other errors occur when connecting devices of multiple 
manufacturers, the users needs to isolate the malfunctioning parts using line 
analyzers, etc.