ABB CI855-1 Analog module industrial system controller

Description

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Monitoring the DP-V0 Communication
The cyclic communication between the DPM1 and the slaves is monitored by the
master and the slaves itself.
If the CI854/CI854A master unit detects a failure in the communication with a
slave, it will indicate the corresponding slave as disturbed. If enabled, Auto Clear
Modus will be activated. On CI854/CI854A a special handling is implemented to
support also redundancy for master and slave. In both cases the monitoring timings
consider the failovers of master and slave.
On slave side the communication with the master is controlled via the watchdog. If
no data communication with the master occurs within the watchdog control interval,
the slave automatically switches its outputs to the fail-safe state.
Please refer also to Connection Error on page 70
Multi Master Systems
In a multi master system several masters are connected to one bus. They represent
either independent subsystems, comprising one DPM1 (DP Master Class 1) and its
assigned slaves, or additional configuration and diagnosis devices. The
CI854/CI854A master unit supports multi master systems.
The Control Builder M with the integrated PROFIBUS master calculation does not
support multi master configurations. The calculation only covers one
CI854/CI854A with its assigned slaves. If you connect several CI854/CI854A or
additional configuration devices to the same bus you have to adapt the bus settings
manually. But only the TTR has to be adapted. An overall TTR has to be calculated
as the sum of all individual TTR for the CI854/CI854A master units connected to
the same PROFIBUS. The resulting TTR has to be manually configured for all
connected CI854/CI854A master units.
Example: you have three CI854/CI854A master units having the automatically
calculated TTR times 20.000, 30.000 and 40.000, then you have to manually
configure the TTR time 90.000 for all three units.
If a standalone tool is directly connected to the PROFIBUS as DPM2 (DP Master
Class 2) master for some acyclic communication, then the TTR time of this
master also has to be taken into account. Otherwise the standalone tool might get
communication problems.