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2-2 Field Control™ Genius® Bus Interface Unit User’s Manual
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October 1999 GFK-0825F
2
LEDs
The LEDs on the Bus Interface Unit show its operating status.
BUS B PWR
ACTIVE
RUN OK
PWR
lights to indicate that +5V power is available for logic operation.
OK
lights to indicate that the module has passed its powerup diagnostic tests.
See the table below for more information.
RUN
lights only if output modules are in the BIU configuration and are written
to by the controlling bus controller. See the table below.
BUS B
if the Bus Interface Unit is installed on a dual (redundant) bus, this LED
lights if Bus B is the currently-active bus.
OK RUN Meaning
ON ON Module functioning, CPU communicating
ON OFF Module functioning, no CPU communications for 3 bus scans
ON Blinking Module functioning, circuit forced
Blinking ON Circuit fault, CPU communicating
Blinking OFF Circuit fault, no CPU communications for 3 bus scans
Alternate Blinking Circuit fault, Circuit forced
Synchronous Blinking No CPU communications - block number conflict
OFF Blinking Electronics/Terminal Assembly mismatch
OFF OFF No block power, or Block faulty