UFC911B106 UFC911B108 ABB Controller module PLC card expansion interface

UFC911B106 UFC911B108 ABB Controller module PLC card expansion interface

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Redundant Optical ModuleBus

In redundant AC 800M HI systems, the redundant optical Cluster Modems enables

redundant ModuleBus communication. Each PM865 is connected to one Cluster

Modem. If one of the optical buses fails, communication is maintained by switching

to the other AC 800M HI processor unit, this does not imply a switch over to

redundant I/O modules.

Redundant Electrical ModuleBus

This is achieved by using optical Cluster Modems and Module Termination Units

(MTUs) designed for housing redundant I/O modules. To take advantage of

redundant electrical ModuleBus, one also needs to use two I/O modules, because an

I/O module is only connected to one of the electrical ModuleBuses.

Failures related to an electrical ModuleBus causes the Cluster Modem(s) to switch

to the second electrical ModuleBus. As a consequence, primary I/O modules are

changed.

Redundant High Integrity I/O Modules

Requires use of optical Cluster Modems and MTUs intended for redundant I/O

modules.