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Connector Name
12V DO Control
Description
Control input that enables
centralized disabling of
Electrically Energized (EE)
relay outputs in selectable
DO modules.
Input open = Relays are
disabled. (ML relays do not
change state)
Input shorted = Relays are
enabled.
3-6
Power Supply Module and Backup Battery
Notes
This input controls a dedicated 12V
power line that is available to all the
slots in the frame. In each relay DO
module, the user can mechanically
select to power the relay coils from this
dedicated 12V power line.
For details on setting this control, see
the Module Configuration section of the
DO Relay Module chapter.
The power supplies on I/O expansion
frames can be attached via DC cable to
the power supply on the previous I/O
expansion frame in a daisy-chain
manner, or directly to the main power
supply. In this case, the 12V DO
control on the main power supply can
control all DO EE relays in the entire
RTU that were configured by dip switch
for 12V DO. This enables the user to
inhibit all DO EE relays in the entire
RTU simply by removing the plug from
the 12V DO control in the main power
supply.
If the main power supply does not
control all other power supplies in the
RTU, it is recommended to have a
single on/off to control DO relays
simultaneously.
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