ABB Advant Controller 450 User Manual

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The Advant Fieldbus 100 redundancy concept comprehends:
• Media redundancy
• Communication interface redundancy.
Media redundancy includes redundant cables and redundant modems.
Communication interface redundancy is achieved by using two interface modules CI522A
connected to a media redundant bus.
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S100 I/O Bus Extension redundancy is available. In this case each I/O rack contains two bus
extenders. Each bus extender is connected to one processor module. The bus extenders that is
connected to the primary processor module is acting as primary, the others are backup (hot
stand-by). A faulty bus extender causes a processor module changeover by stopping the primary
processor module. The previous backup processor module is now acting as primary processor
module and previous backup bus extenders, connected to the new primary processor module,
are primary bus extenders.
A changeover, due to a faulty bus extender, is only activated when all backup bus extenders are
functioning. If a faulty backup bus extender exists, when any of the primary bus extenders is
detected as faulty, the faulty primary bus extender is marked as erroneous and a system message
is presented.
You can replace the malfunctioning bus extender when the system is running. If an error arises
in a backup bus extender, you can also replace the backup unit while the system is running.
Errors which occur in the backup unit can never affect the primary units operation. The primary
units and the backup units are logically separated from one another.
The application programming and the communication are totally unaffected by the redundancy.
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The controller primarily uses single process functions, for example transmitter, valve, or switch.
However, for the categories analog input and analog output, there are special I/O modules which
can be duplicated. Different requirements for single loop integrity or signal redundancy are met.
Please refer to Section 1.7.6.1, S100 I/O.
Duplicated hardware is kept together in the data base as one object. From a maintainability
viewpoint, duplicated hardware is handled individually. Functionally, the redundancy is,
however, invisible to the control application program. Duplicated hardware is wired in a
common terminal panel or connection unit.
You can mix redundant and non-redundant I/O modules in any application-adapted way.

ABB Advant Controller 450 Specifications

General

Brand	ABB
Model	Advant Controller 450
Category	Controller
Language	English