ABB CP450-T-ETH Analog module industrial system controller

Description

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The BC820 CEX-Bus Interconnection Unit, shown in Figure 24 on page 68, offers a
way to section the CEX-Bus into two independent segments. This improves
availability in systems with redundant communication interfaces. Figure 23 on page
67 shows a configuration example. The base plate has a preset, two letter Alpha
code lock to prevent the installation of an incorrect type of unit onto the TP850 base
plate.
The BC820 is powered from the processor unit via the CEX-Bus and can also
support the CEX-Bus with redundant power through its external connector for
power supply.
BC820 transmits the RCU-Link and extends the CEX-Bus and RCU-Link cable
length up to 200 m. The number of CEX-Bus interfaces is limited to 6 with each
BC820.
It is not allowed to manipulate CEX bus base plates in a powered and running
system. Before changing or removing a base plate, all CEX modules on that
segment must be removed.
BC820 can only be used with PM858, PM862, PM866 (PR:F or later, which
corresponds to PR:H or later for PM866K01), PM866A