Mitsubishi MELSEC-A Series Reference Manual page 122

6. LlNK DATA SEND/RECEIVE PROCESSING
AND PROCESSING TlME
(3)
(c) Normally operating local stations can recognize the station number at which the
communication error has occurred by reading the data in M9255 and D9252 to
D9255.
At the link devices which receive data from the station at which the
communication error has occurred, the data is maintained in a state just before
the occurrence of communication error.
(d) All remote I/O stations operate normally.
When a communication error occurs at a remote I/O station
(a) At the remote I/O station, all of the output points of the output modules and
special function modules installed to the host station are turned OFF.
(b) The master station can recognize the station number at which the
communication error has occurred by reading the data in M9231 and D9228 to
D9231.
At the link devices which receive data from the remote I/O station at which the
communication error has occurred, the data is maintained in a state just before
the occurrence of communication error.
(c) All local stations operate normally.
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