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Chapter 2
Sm@rt DAS System
Introduction
The Sm@rt DAS system consists of a controller, VL and WL
breakers with MODBUS communication modules, and a
MODBUS RTU to TCP/IP gateway.
Controller
The heart of the Sm@rt DAS system is the controller. It
consists of a PLC with pre-loaded software which is the same
for every Sm@rt DAS system. All configuration is done at the
factory. The program is flexible and configuration settings are
accessible over MODBUS.
Figure 2.1 highlights the inputs and outputs available on the
controller.
Power
Supply
(120VAC
or 24VDC)
Ethernet
connection to
MODBUS
gateway/router
Ethernet
Modbus
TCP/IP
Figure 2.1: Sm@rt DAS Controller
Sm@rt DAS Controller
Digital Inputs (24V DC)
I.0
I.1
I.2
I.3
O.0
O.1
O.2
O.3
Digital Outputs (24V DC)
Digital Inputs
Each breaker that has Sm@rt DAS is assigned a digital input. It
moves from left to right and top to bottom in the lineup. The
input requires 24V to activate. This is typically done via an
activation switch.
Digital Outputs
Each breaker in the Sm@rt DAS system has an assigned
output from the controller. When it is confirmed that a
breaker is in maintenance mode, "24V DC" appears in the
output. The outputs can drive indicators (typically blue LEDs)
for visual confirmation of system status.
Ethernet connection
The Sm@rt DAS controller communicates with the breakers
via Ethernet connected to an Ethernet-MODBUS RTU gateway.
An Ethernet switch or router can be inserted between the two
to expand communication possibilities.
I.4
I.5
I.6
O.4
O.5
O.6
I.7
I.8
I.9
O.7
O.8
O.9
5
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