ABB CI861 3BSE058590R1 Analog module industrial system controller

Description

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The communication between the CI854/CI854A master and the slave is monitored
by both units, the master and the slave. In case of an error, specific reactions on the
master and the slave side will take place. Please refer also to Monitoring the DP-V0
Communication on page 25.
If the CI854/CI854A master unit detects the loss of communication with the slave
unit the error “Connection down” will be indicated for the specific slave. The
AC 800M controller stops the copying of input data and activates ISP (Input Set as
Predetermined) control for the related variables. During “Connection down” the
status for Error/Warning and Alarm/Event will not change. If the connection gets reestablished the status will be updated.
If the slave unit detects the loss of communication with the master unit it activates
the OSP (Output Set as Predetermined) control for the related output channels.
A connection error can be caused by reconfiguration or a temporary error such as
cable error. If a temporary error is corrected, the connection will be reestablished
automatically.
System Error
On CI854/CI854A two watchdogs are implemented that have to be triggered
otherwise the module switches into a safe state mode and stops the communication
on the PROFIBUS. The connections to all connected slave units get interrupted.