As a major Distributed Control System provider ABB has a comprehensive strategy for redundant system components. These features are further enhanced by FOUNDATION fieldbus technology as described here.
-Back Up LAS
FOUNDATION fieldbus offers the control engineer the opertunity to distribute control functions into field devices. The enabling technology involves the exact transmission of data between devices and the execution order and timing of the distributed functions. It is the Link Active Scheduler (LAS) which dictates these events and so the FOUNDATION fieldbus standard provide back-up LAS function in field devices..
-Back Up Linking Device and H1
Although not part of the FOUNDATION fieldbus specification ABB offers the ability to automatically switch to a back up Linking Device in case of the primary Link Device failing.
-H1 short circuit protection
The ABB Field Barrier is a device designed to maximize the flexibility for H1 topology design. One of its benefits increases field device availability by way of short circuit protection. It is also possible to use armoured H1 trunk cable to provide additional protection.
-Redundant Power Supply
The redundant Power Supply from ABB for the ABB Power Conditioner of the H1 bus increase the H1 segment availability furthermore.