3-80
Channel Alarm
RCV Frame Loss
Eye Closure
RSL Alarm
• PWR Supply Alarm – This summary alarm is activated by any A or B power supply
failure.
• Controller Fail – relay is activated if a card select has not been detected in the pre-
vious approximately 200 msec.
• Status:
• A XMTR In Service – A-side transmitter module is on-line.
• B XMTR In Service – B-side transmitter module is on-line.
• A RCVR In Service – A-side receiver module is on-line.
• B RCVR In Service – B-side receiver module is on-line.
• A I/O In Service – A-side I/O interface module is on-line.
• B I/O In Service – B-side I/O interface module is on-line.
• Switch Off Normal – Click on OFF NORM LED on USI Status Alarm screen to
view message. Indicates manual control enabled or any of 22 conditions exists.
Refer to the Maintenance Section
for details.
3.22.6 Relay Control Outputs
Control outputs and control status inputs operate together to perform
control functions. The control status inputs to the relay interface must
be properly wired to the external equipment that is being controlled by
the associated control output in order to display the ON or OFF status
on the USI control screen. Without the control status inputs, the control
function on the USI screen will still turn on equipment/functions, but
no status will be indicated and, once turned on, the equipment/func
-
tion cannot be turned off.
Six relay control outputs (CTRL 1-6) provide relay closure to ground (provisioned NC) or
open (provisioned NO) when activated. These relays default to open if card power is lost.
The maximum contact rating for each relay is 0.5 A, 100 Vdc.
Nine buffered status inputs (CTRL STATUS 1-6) from the equipment controlled by the
CTRL 1-6 outputs, verifying the controlled function. The inputs are diode protected from
voltages outside of the 0 to +5 V range, and have a 10K Ohm resistor for current limiting
purposes. In addition, each input has a 100K Ohm pull-up resistor.
Note
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