UFC911B110 UFC921A101 ABB Analog expansion module

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.