
11.PMC ALARM MESSAGES AND ACTIONS TO TAKE B-63983EN/02
- 1054 -
11.2.3 Sample Cases
A system alarm occurs once a day.
<Category> Improper cable type, cable cut, or inadequate
connection
<Configuration>
NC
Operator's
panel I/O
Group 0
Connector
panel I/O
Group 1
I/O Unit-A
Group 2
Optical I/O link
adapter
Optical I/O link
adapter
Optical cable
<Cause> Groups 0 and 1 were connected using a cable to
which a +5 V power wire was attached.
<Explanation> The cable to which a +5V power wire is attached is
intended to connect optical I/O Link adapters.
When not using optical I/O Link adapters, use a
cable to which a +5V power wire is not attached.
Note that, when this troubleshooting work
(replacing the cable) was done, the operator's panel
I/O module was replaced as well. Therefore, the
direct cause of the error might have been the
operator's panel I/O module.