
B-63983EN/02 11.PMC ALARM MESSAGES AND ACTIONS TO TAKE
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(12) Failure to connect the optical I/O Link adapter to ground
The optical I/O Link adapter, which accomplishes conversion
between electrical cable and optical cable, uses its own case as a
grounding body. Therefore, the case of the adapter must be
connected to ground.
(13) CNC or I/O device malfunction or failure
A communication error may stem from a hardware malfunction
or failure. Try replacing boards having an I/O Link connector
(master PCB and PMC boards), the PMC control module (which
may be attached directly to the master PCB in some PMC types),
back panel, individual slaves, or other adequate components.
(14) Operation mistake
If the error has occurred only once, it may be due to an operation
mistake, such as turning off the power of the slave inadvertently.