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MELSEC-Q
8 TROUBLESHOOTING
8.3 Error Codes
When a trouble such as data link failure has occurred, the error cause can be identified
by an error code.
8.3.1 How to check error codes
To check error codes for all network modules, follow either procedure (1) or (2)
described in this section.
For cyclic transmission error and for dedicated instruction failure, the procedure
described in (3) and (4) can also be used respectively.
REMARKS
By using GX Works 2, error history of the entire system can be checked even after
errors were cleared by powering on and then off the programmable controller or by
resetting the programmable controller CPU. (Refer to (2) (b) in this section)
(1) Checking with GX Developer
On GX Developer, select [Diagnostics] [System monitor], and then click the
Module’s Detailed Information button.
REMARKS
By changing parameters set in transfer setup of GX Developer, error codes of other
programmable controller in the network can also be checked.
Displays the latest error code.
Displays error history.
Displays the description of the error code
selected in error history and action against
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