UFC911B110 UFC921A101 ABB Analog expansion module
UFC911B110 UFC921A101 ABB Analog expansion module
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If redundant MTUs are used, the I/O modules can be configured for “Hot
Replacement mode”.
In this configuration, the redundant slot in the MTU is left empty, and a new I/O
module can be inserted upon detected channel fault(s).
The AC 800M HI treats input and output modules differently:
Input Modules
The controller assigns one of the input modules in a redundant pair as primary and
the other one as backup. The input values and their status are read from the primary
module and will be treated as valid until the module reports channel- or module
fault, or until the communication is interrupted.
The backup module in the pair is accessed from time to time (typically every 10th
scan of the primary) to determine the status of the channels, the module itself and
the electrical ModuleBus.
Upon a channel fault on the primary module, the controller switches to the backup
module and assigns it as the primary; the previous primary module will be stopped.
Output Modules
Digital outputs in a redundant pair are both active, both modules are always
accessed one after the other in sequence. Both modules are therefore given the same
values and both modules controls the outputs (and the field), which enables
uninterrupted control of the outputs in case of a channel, module or electrical
ModuleBus fault.
