ABB CI855K01 3BSE018106R1 Analog module industrial system controller

Description

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With PROFIBUS and CI854/CI854A you have a high scalability for redundancy.
You have the options to configure redundancy for:
• PROFIBUS master unit CI854A
• PROFIBUS slave unit
• PROFIBUS line.
Depending on your needs each type of redundancy can be configured independent
of each other. Also mixed configurations are supported. You can configure for
example a redundant PROFIBUS installation consisting of a redundant CI854A
master unit and redundant PROFIBUS lines and have connected redundant and nonredundant slave units in parallel.
A special mixture of redundancy is the so called combined slave and line
redundancy. A slave provides two slave units supporting the PNO slave redundancy
and each slave unit only provides one PROFIBUS interface. This is a one error
tolerant solution. The slave unit will only have communication on one PROFIBUS
line at a time and a single error on the PROFIBUS line will lead to a switchover of
the slave units. But the big advantage of this solution are the reduced cost. Therefore
it is a very popular solution. It is used for example for S800 I/O with CI840 and
S900 I/O with CI920.
Master Redundancy
The CI854A supports PROFIBUS master redundancy. Two CI854A connected to
one controller can be configured to work in a redundant configuration. The
configuration for redundancy is done via configuring the CI854A in the hardware
tree of the Project Explorer. For configuration of redundancy please refer to Add
Redundancy for Master Unit on page 41.