The fieldbus barrier is mounted in a 316L stainless steel,

increased safety, Ex e enclosure that segregates spur and

trunk cabling in accordance with hazardous area certification.

Inside the enclosure, the incoming trunk wiring terminates

in a separate compartment containing increased safety (Ex

e) trunk wiring terminals. This compartment has a protective

cover to deter interference, and carries a warning to the user

not to work on trunk wiring without first isolating the power.

A fieldbus terminator is included for the trunk wiring to ensure

correct termination of the wiring and prevent unwanted

reflections and signal disturbances.

The system described in this manual provides 12 spurs of

“simplex” type – meaning they are not intended to provide

redundancy between spurs. Each spur is short circuit

protected, so that other devices continue to operate in the

presence of field wiring faults.