Manual

Operation and Troubleshooting
Appendix A
A3
The following tables shows the diagnostic information each of the LEDs
provide. We have spilt them into two categories: the host board and the
MAC board.
Table A.A
LEDs
Associated with the Host Board
When this LED(s):
does this: then:
PASS goes ON green the host and MAC boards performed and passed
self-diagnostic tests.
FAIL goes ON red the host board has either:
- failed the self-diagnostic test or
- faulted while in operation
TEST goes ON yellow the host and MAC boards are performing
self-diagnostic tests.
ERROR blinks ON red once after the message is complete, one of the
following has occurred:
- there is an error in the ladder diagram program
- the message instruction is incorrect or received
an error status from the MAC board or remote
station.
-there is a module or cable problem
BACKUP MODE goes ON yellow the KP3 is functioning as a module in a backed-up
system. Link addresses should be the same on
the primary and backup modules. When it is the
backup module, Data Highway II assumes its link
address is one number higher than the primary
KP3.
ACTIVITY SA T goes ON yellow the node has reached the peak of its ability to
process messages.
ACTIVITY NORMAL all three ON green the amount of message activity is high. If just one
is ON, the amount of message activity is low . The
three ACTIVITY NORMAL LEDs work like a bar
graph.
EXIT COMP goes ON yellow this node has gracefully exited the ring on the
Data Highway II link.