Epni Board - Honeywell LC13-510 Manual

3.3.6 EPNI Board

The EPNI board is a controller board which interfaces the bus and processor in a similar
way as the controller boards listed in subsection 3.3.2. First, check the
light (red - should be out) and
board.
The light (red) is driven by a microprocessor on the EPNI board. If it is
SELF TST/ERR
on, check for the following causes:
• There was a hardware failure on the EPNI board.
• A problem was detected on-line (for instance, there may have been an EPNI local
RAM parity error or a duplicate address may have been detected).
• The node was shut down (stunned) due to a watchdog timeout.
• The number of raw errors detected exceeded a preset threshold, causing the
software on the EPNI board to enter the failed state.
If the state of the
SELF TST/ERR
this instruction. Under normal system operating conditions, the following indicators and
connections are present on the EPNI board:
• are out.
Red LEDs
• is on.
Green LED
•
The TX yellow LED
traffic).
Check that there are no disconnected or broken cables. If part of the UCN has failed, the
failure reporting and diagnostic tests included in the software will help isolate the problem.
Dual Node Module Service
NOTE
The EPNI board is a later version of the PNI board.
PASS MOD TEST
light and
PASS MOD TEST
either blinks on and off (indicating traffic) or stays on (heavy
3-10
light (green - should be on) on the EPNI
light are correct, continue with
3.3.6
SELF TST/ERR
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