Installing the PM861/PM864/TP830 Processor Unit in Redundant Configuration Section 2
64 3BSE 027 941 R301
Installing the PM861/PM864/TP830 Processor Unit in
Redundant Configuration
In redundant configuration two PM861/PM864 units are mounted onto two separate
DIN-rails. If sufficient space is available, the units can be mounted onto the same
DIN-rail
Use the following procedure to install the processor units along the DIN-rail:
1. Mount the processor units. Mount the communication interfaces on the CEX-
bus to the left of the processor unit. All interfaces can be mounted on the same
CPU or divided between the two.
2. Press them gently together and make sure that the CEX-bus is correctly
connected, via the connectors on the baseplates.
3. Mount the CEX-bus extension cable TK850 to the units at farthest away from
the processor units or, if no units are mounted, directly to the CEX-bus on the
processor unit. The CEX-bus extension cable must be connected to both CPUs
whether or not there are any other CEX-bus units (Figure 16 on page 66).
4. Connect the RCU Link Cable TK851 to both CPUs.
Note that in redundant CPU configuration, COM3 and the electrical ModuleBus on
the baseplate can not be used.
Note that the RCU Link Cable TK851 must be used and can not be replaced by
a similar cable. Using another cable will disable the identification of the CPUs
in the CB and Operator Station.
When running in single configuration the RCU Link Cable TK851 performs
the function of a termination plug.
The CPU connected to the RCU Link Cable connector marked “UPPER” will
be defined as “UPPER” in the Control Builder and Operator Station. The
marking has no relevance to the physical placement of the CPUs. Any CPU can
become the Primary CPU. However at the first power on, the “UPPER” CPU
will take the role of Primary CPU.
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