22.
22 - 15
TROUBLESHOOTING
22.3 Error Code List
When an error occurs at PLC power ON, on switching to the RUN status, or during the
RUN status, the self-diagnostics function displays the error content (by LED indication, or
message display on an LED indicator), and stores the error information at a special relay
(SM) and special register (SD).
If an error occurs on a data communicaton request from peripheral devices, a special
function module and the network system to the CPU module, error codes (4000H to
4FFFH) are returned to the request source.
QnACPU errors and corrective actions are described in this section.
(1) How to read the error code lists
The following shows the way of reading the error code lists from Section 22.3.3 (1000
to 1999) to Section 22.3.9 (9000 to 9999).
(a) Error code, common information, and individual information
Alphanumeric characters in the parentheses of the titles indicate the special
register numbers where the individual information is stored.
(b) Compatible CPUs
QnA : Compatible with all the QnA series and Q2ASCPU
series.
Each CPU module : Compatible with the listed CPU module.
(Example: Q4AR, Q2AS)
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