Mitsubishi Q2ASCPU - Error Code

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6. ERROR CODE
If an error occurs when the programmable controller is powered ON, switched to
RUN status or running, the Q2ASCPU module executes the self diagnostics
function to display the error (LED display, message display) and store the error
information into the special relay SM and special register SD.
Also, if an error occurs when a communication request is issued from a
peripheral device, special function module or network system, the Q2ASCPU
module returns the error code (4000
H to 4FFFH) to the request source.
The following explains the Q2ASCPU errors and the corresponding corrective
actions.
REMARK
The error code of the error that occurred when a general data processing request
is made from the peripheral device, special function module or network system is
not stored into SD0 of the Q2ASCPU.
The error code is returned to the source of the general data processing request.