ABB CI856 3BSE026055R1 Analog module industrial system controller

Description

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Primary and backup CI854A need different node addresses on PROFIBUS. While
the primary node address is configured via the settings in the HW Configuration
Editor the node address for the backup module is defined by the fixed offset -1 to the
node address of the primary module. Therefore you cannot configure the node
address 0 on PROFIBUS with CI854/CI854A. This is reserved for redundancy.
During normal operation only the primary CI854A has communication with the
slave units. The backup unit is in hotstandby mode. It is configured by the controller
and synchronized by the primary unit. If there is a failover because of for example a
disturbed PROFIBUS communication, primary and backup module change the node
addresses. During failover the former primary module will get reset.
After download and successful configuration the availability of the backup unit is
monitored. This includes the balancing of current data and the communication links
via PROFIBUS and CEX-Bus as well. In case of no error the DUAL LEDs on
primary and backup unit will be lit. If the backup unit is not ready to takeover the
DUAL LEDs will get off on both units. The error will be indicated in the unit status
and a potential redundancy switchover will be inhibited in this case.
Reasons to perform a switchover are for example that the primary unit has lost the
communication to all connected slaves “All slaves failed” because of for example a
cabling problems or a “Fatal error” on the primary CI854A itself was detected.
Slave Redundancy
The CI854/CI854A supports the PROFIBUS slave redundancy like specified by the
PROFIBUS User Organization (PNO). The specification can be found at
http://www.profibus.com.
A redundant slave has two PROFIBUS interfaces, one for the primary and one for
the backup slave. If line redundancy is used, one of the interfaces is connected to
line A and the other to line B. If not, both interfaces are connected to the same
PROFIBUS cable. The PROFIBUS address of the backup slave is always the
The PROFIBUS master redundancy is only supported by CI854A and not CI854.
You also have to use the AC 800M controller type PM861A, PM864A or PM865
to drive the redundancy.
If the CI854A is configured for redundancy the watchdog time will be increased
automatically by 1000 ms. This is needed to allow the CI854A a switchover
before the slaves will activate OSP (Output Set as Predetermined) control.