Fault LEDs SI1 and SI2
LEDs SI1 and SI2 indicate faults in communication via interfaces SI1
and SI2:
LED SI1 LED SI2 Cause
on
on
Communication is not possible at both
interfaces. Internal fault.
on
off
SI1:
No communication possible.
Internal fault.
SI2:
Interface is initialized and ready.
LED SI2 is always off if no interface module is
inserted.
off
on
SI1:
Interface is initialized and ready.
SI2:
No communication possible.
Wrong module inserted or internal fault.
off
off
Both interfaces are initialized and ready.
LED SI2 is always off if no interface module is
inserted.
CPU 948
System Manual
5 - 14
C79000-B8576-C199-03