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Backplane Connections
Alarm Cutoff
The shelf backplane provides a wire-wrap pin for connection to an external alarm cutoff circuit.
Alarm Contacts
The COT shelf provides access to the PAU/PMU alarm relays by way of wire-wrap pins on the COT shelf
backplane. Both normally open (NO) and normally closed (NC) relay operation is supported.
configuration of the alarm relays.
External Alarm Relays
NO
Critical
COM
Audible
NC
NO
Critical
COM
Visual
NC
NO
Major
COM
Audible
NC
NO
Major
COM
Visual
NC
NO
Minor
COM
Audible
NC
NO
Minor
COM
Visual
NC
NO
Shelf
COM
I.D
NC
Front Panel Alarm LEDs
Critical (Red)
Minor (Yellow)
Front Panel ACO LED
ACO (Yellow)
Figure 3. Alarm Relay Contacts from PAU/PMU to COT Shelf Backplane Wire-Wrap Field
Relay contacts are shown when alarm is not active.
16
X
X
X
X
X
X
X
Major (Red)
January 6, 2003
Alarms from COLU & MUX Units
(via Backplane Communication)
ACO Push Button
PAU
(PAU/PMU Front Panel)
or
PMU
External ACO Push Button
(Backplane Rear)
Relay Key:
= Normally Open (NO)
= Normally Closed (NC)
SCP-PCS718-010-06H
Figure 3
shows the
PCS-718 List 1
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