![]() ![]() ![]() Testing it is simple: set up a single-controller system with FLEX outputs configured to hold last state during a Fault, set some of them = ON, and unplug the CompactLogix. Remember that Program Mode and Fault Mode are separate settings for FLEX I/O. You are correct to be looking at the Fault Action configuration for the 1794 FLEX Output modules they should be able to be set for Hold Last State during a Fault condition. Support for those systems is only available through the local field sales office that approved you to use it. You can only get it from a Rockwell Automation sales office, and only if you are approved by them and their country manager and/or Commercial Engineering at RA. The document and the accompanying "hot backup tool" code generation software is not publicly available. I am aware of a Application Technique document for High Availability CompactLogix that was last updated as version 4.0 about five years ago that used 1769-元0ER and 1794-AENTR products and architectures. There have been some attempts over the years to implement "hot backup" with ControlLogix and CompactLogix. The only Studio 5000 family controllers that support real "Redundancy" are the 1756 ControlLogix, when equipped, configured, and programmed properly with the appropriate firmware, network modules, network architecture, and Redundancy Manager modules.
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