FANUC Robotics America GFK-1535A - Manual (Page 39)

2-20 VersaMax™ System Genius® Network Interface Unit User's Manual – November 2000 GFK-1535A
2
Observing the LEDs
The LEDs indicate the presence of power and show the operating mode and status
of the NIU.
BUS B
SBA ERR
I/O ENBL
FORCE
PWR
FAULT
OK
PWR Indicates that the NIU is receiving power.
OK Indicates diagnostics executed successfully.
FAULT Is ON if there are one of more faults.
I/O ENBL This bicolor LED is green if the I/O scan is
enabled and data is being received from the
bus. Otherwise, this LED is amber.
FORCE Is ON if one of more I/O points is forced* or
bus switching is forced.
SBA ERR Is ON if a duplicate device SBA or no valid
SBA is selected.
BUS B Is ON if bus B is active.
* Forcing inputs and outputs from the programmer does not force the actual input
and output points on the NIU. Forcing actual I/O points requires the use of
datagrams from the PLC to the NIU.