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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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