ABB CI856K01 Analog module industrial system controller

Description

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address of the primary slave plus 64. The configuration in the Control Builder
ensures, that both addresses are available when the slave is set redundant. If a
redundancy switchover of a slave occurs, also the PROFIBUS addresses are
switched. That means, the primary slave always has the assigned address and the
backup slave always has the address + 64 regardless of who is the primary and who
is the backup. This kind of redundancy is called “flying redundancy”.
Only the primary slave can transfer process data and diagnostic information on the
PROFIBUS. Therefore the status of the primary slave also contains the information
of the backup slave. Please refer to the slave documentation for the details.
Although the backup slave has no active data transmission with the master the
CI854/CI854A is able to monitor the backup slave. The backup slave is available in
the Livelist and if redundancy is configured the monitoring will be activated. If the
backup slave fails, the information “Redundant slave does not exist” will be set in
the ExtendedStatus of the primary slave.
To allow the slave a failover in case of an error the CI854/CI854A has a special
monitoring function. If the redundant slave gets disturbed the CI854/CI854A waits
for (2* watchdog time + 1) before connection down will be indicated for the slave.
During this time the slave can perform a switchover and proceed with the normal
data exchange without interrupting the communication.
Line Redundancy
The CI854/CI854A supports line redundancy for PROFIBUS DP. Therefore the two
interfaces “PROFIBUS A” and “PROFIBUS B” are available on the baseplates
TP854 of the modules. There is a Redundancy Link Module functionality
implemented on the CI854/CI854A that handles the sending and receiving of data
on the PROFIBUS. Independent of any configuration the RLM sends data on both
lines and receives data only via one line. Regarding the receiving of data the RLM
checks if the slave sent data on both lines and if the data is valid. The first received
valid data on line A or B will be picked up and operated. It is possible that the slave
sends data on both lines in parallel or only on one line.
The monitoring of the line redundancy can be enabled or disabled. The default is
disabled. The enabling is done via the parameter “Line redundancy” in the settings
If the non-redundant slave gets disturbed the CI854/CI854A waits for watchdog
time before connection down will be indicated for the slave.