Motorola ACE3600 RTU, Owner'S Manual

Page: 147 / 379

11-1
DIGITAL OUTPUT SBO RELAY MODULE
General Description
The DO Select Before Operate (SBO) Relay modules have 8 or 16 Electrically Energized (EE)
relay outputs. In Electrically Energized (EE) relays, the outputs return to the non-energized
state in case of power off or module failure.
The following DO SBO relay modules are available:
•
8 DO SBO 2 Form A Relay 2A
•
16 DO SBO Relay 2A
The 8 DO SBO Relay module is supported by ACE3600 firmware v14.00 and above. The 16
DO SBO Relay module is supported by ACE3600 firmware v16.00 and above. The DO SBO
module is used to ensure that the correct DO has been selected before actually activating the
relay.
8 DO SBO :
The 8 DO SBO 2 Form A Relay 2A module has eight Electrically Energized (EE) relay
outputs. Each DO in the module has two Form A 2A EE relays. When the module is in Idle
state, the operate signal is disabled and no relay is activated. On “DO Select” command, both
DO relays are selected. The select command is physically monitored by a back indication
signal (“Check Select”.) After validation that only the requested relays were selected, the
“Operate” command is set and enables the relay activation. The physical back indications from
both relay contacts can be monitored by the application program to verify successful
operation.
16 DO SBO:
The 16 DO SBO Relay 2A module has 16 Electrically Energized (EE) relay outputs. Each DO
has one 2A EE relay. When the module is in Idle state, the operate signal is disabled and no
relay is activated. On “DO Select” command, a DO relay is selected. The select command is
physically monitored by a back indication signal (“Check Select”.) After validation that only
the requested relay was selected, the “Operate” command is set and enables the relay
activation. The physical back indications from relay contacts can be monitored by the
application program to verify successful operation.
Note that only a single SBO DO can be selected at a time.
Each output has two types of back indications:
a. Back indication of the relay select command.
b. Back indication from the relay auxiliary contact (each relay has 2 contacts- one
connected to user and the other as back indication.)
By default, the operation of the relays on the 8 DO SBO Relay module uses the 12V controlled
source (controlled by the jumper on the main power supply.) If the 12V control in the main