Each enclosure system uses duplicated Fieldbus Barrier modules in a redundant

configuration to achieve significantly higher system availability than equivalent

‘simplex’ units. The 9372-FB may therefore be selected for critical process applications

where failure of the Fieldbus Barrier would otherwise result in unacceptable downtime

or lost production. It is also ideal for use in Fieldbus Safety Instrumented Function (SIF)

networks in which nuisance trips cannot be tolerated. Failure annunciation to the host

control system is provided by means of an integrated Foundation™ fieldbus device with

Digital Input Function Block capability.

In common with conventional Fieldbus Barriers, each intrinsically safe spur is

capable of supporting a FISCO or ‘Entity’ certified fieldbus device located in a Zone 0 or 1

hazardous area. The short-circuit protected spurs are galvanically isolated from the trunk

and require no protective ground connection in the field.