1. INTRODUCTION
The 5704 Series Control System is a microprocessor based system
which displays the reading and status of connected gas detectors.
The system provides complex alarm handling facilities with a full
maintenance capability.
AracksystemisttedwithanumberofFourChannelControlCards
each with an associated Quad Relay Interface Card which provides the
necessary sensor input and optional relay output connections. A Relay
Interface Assembly may be used to expand the number of relay outputs
available for each of the Four Channel Control Cards. Simple alarm
handling and operation is provided by each channel control card.
Complex alarm handling is achieved by communication between a
speciednumberofcontrolcardsviathebackplaneoftherack.
An Engineering Card is tted to each rack and provides control of
the rack backplane communications, control card interrogation and
facilitates maintenance.
In small systems power supplies, auxiliary power supplies and battery
back up systems can be connected to the rack via a DC Input Card. In
heavily populated installations of more than eight Four Channel Catalytic
Control Cards, power supplies are connected to each individual Four
Channel Catalytic Control Card via its interface card.
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