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11 TROUBLESHOOTING
Read command
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REMARKS
When data is communicated using the MC protocol, the displayed ERR. LED may
not be turned on if the Q series C24 sends an NAK message to the external device
in response to the command message.
Error codes (see Section 11.2) corresponding to the error content when the NAK
message is sent back to the external device are stored in the following areas. (When
communicating with an A compatible 1C frame, the error codes differ from the
transmission error code.)
To check error codes transmitted by the programmable controller CPU, incorporate
the following program (in case of the interface on the CH1 side).
Check the error codes and take corrective action according to Section 11.2.
MELSEC-Q
Reads transmission error codes from address 25A
Clears error codes.
.
H
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Table of Contents
Troubleshooting
