
11.PMC ALARM MESSAGES AND ACTIONS TO TAKE B-63983EN/02
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11.2 I/O LINK COMMUNICATION ERRORS AND ACTIONS TO
TAKE
If an I/O Link communication error occurs, the system generates a
system alarm, displaying an error message of the following format.
PC050 IOLINK CHn GRa:bb
In this message format, CHn (where n is 1 or a higher number)
represents the number of the channel that has caused the
communication error. “Gra” represents a group number in which a
problem may occur. “bb” means internal code.
However, correct group number may not be shown depend on cause or
condition of the communication error. Please note that it is difficult to
identify the cause of the error or the location of the fault with these
values alone, for the following reasons.
(1) If the communication error has resulted from a hardware fault or
noise, these register values themselves may not be correct.
(2) Different register values may be presented for the same cause
depending on the timing of the error occurrence.
Therefore, it is important to consider other circumstantial factors in
addition to this displaying.