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When a failure is detected in one of the modules, its output is driven to 0 mA and the corresponding channel in the good module automatically continues supplying the proper current to the output current loop. Configurable options in the modules for output failsafe and fallback options are always set to their default values (0 mA). This removes one of the pair of redundant output channels from service for detectable problems such as a module not properly receiving output writes or not passing diagnostic tests on FBM microprocessor writes to output registers. Using the default failsafe/fallback options of 0 mA output also minimizes the possibility of a “fail high” result.

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