108 Input/Output Modules
Trident Planning and Installation Guide
Solid-State Relay Output Module
The following relay output components are available.
The Solid-State Relay Output (SRO) Module is a non-triplicated module for use on
non-critical points which are not compatible with high-side, solid-state output
switches; for example, interfacing with annunciator panels. The SRO Module
receives output signals from the MPs on each of three channels. The three sets of
signals are then voted, and the voted data is used to drive the 32 individual relays.
Each output has an I⁄O loop-back circuit which verifies the operation of each relay
switch independently of the presence of a load. Ongoing diagnostics test the
operational status of the SRO Module.
The SRO Module supports hot sparing for online replacement of a faulty module
or continuous back-up to an active module. The SRO Module is mechanically
keyed to prevent improper installation in a configured baseplate.
Model Description Voltage Type
3451 Solid-State Relay Output Module 24 V DC Commoned,
in groups of 2
2451 Solid-State Relay Output Baseplate Direct Termination
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