Operation and Troubleshooting
Chapter 6
65
In the RUN position, the interface can communicate with other nodes of
the Data Highway II link. When you power up the interface in the RUN
position, it first goes through a reset cycle and a 15-second self-diagnostic
test cycle before seeking membership in a logical ring on the Data
Highway II link. Because each of the other switch positions causes the
interface to reset, the node seeks membership in a logical ring when you
switch into the RUN position.
In the momentary RESET position, the interface goes through a reset
cycle and a 15-second self-diagnostic test cycle. If this node is not in a
logical ring (because you pressed the EXIT REQUEST switch), resetting
the interface causes it to seek membership in the logical ring again.
After installing the 1779-KP2 interface as we described in Chapter 4,
switch to the TEST position before you power up the interface for the first
time. This provides the most extensive test cycle to ensure that the
interface is operating properly before you attempt to communicate
through it. Each test cycle takes approximately 50 seconds. If you leave
the switch in the TEST position, the interface will continuously execute
the test cycle. Leave the switch in the TEST position at least 15 seconds.
When you switch to the RUN position, the interface will continue through
the end of the current test cycle; if no faults are detected, the NODE PASS
indicator turns on green. At this point the interface is in the RUN
position. In the RUN position:
Initially, the PORT-READY indicator turns green and the
IN-RING/SEEKING-MEM indicator turns yellow to indicate that this
node is seeking membership.
If another node interface is connected in the Data Highway II link in
the RUN position, the SIG QUAL indicator turns green and then the
IN-RING/SEEKING-MEM indicator turns from yellow to green to
indicate that this node is now logically in a ring and receiving a token
periodically.
If there is a cabling problem or no other node interface is in the RUN
position, every ten seconds the MAC board goes through a one-second
self-diagnostic test. This is indicated by the MAC TEST indicator
turning yellow and the IN-RING/SEEKING-MEM and REDUN
WARN indicators flashing rapidly.
If another node on the link has the same address, the DUP ADDR
indicator on either this node, the other node, or both, will turn red.
Exactly which will occur cannot be determined because of the random
position of the token.
Operating the KP2 Interface
