SST-PFB-CLX Remote Rack Configuration.PDF 
This document applies to the SST-PFB-CLX module.
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To design a redundant Profibus I/O control system with ControlLogix architecture, the SST-PFB-CLX card must be installed in a remote ControlLogix rack. In this setup, it communicates with ControlLogix CPUs via the 1756-CNB family of ControlNet bridge cards.
Although SST’s documentation explains how to set up the SST-PFB-CLX card and ControlLogix CPU to communicate through the local rack, no SST documentation describes how to use the card remotely (as required for a redundant system).
According to document 1756Soft_HBU.pdf, Application Solution “Software Output System” (Publication number 1756-AP001A-US-E), it is possible to build a ControlLogix redundant system without the 1757-SRM modules, using ladder logic to switch control between CPUs.
