Section 2 Installation Installing the CEX-Bus without BC810
3BSE036351-510 A 97
Installing the CEX-Bus without BC810
The CEX-Bus, used for connection of communication interfaces to the processor
unit, is located on the left-hand side of the processor unit baseplate (TP830).
A bus termination unit must always be fitted to the last unit on the CEX-Bus, as
shown in Figure 25 on page 80. A TB850 male CEX-Bus termination unit is
supplied with each PM8xx/TP830 processor unit.
However, should the configuration require the use of a TK850 extension cable, as
shown in Figure 26 on page 81, then a TB851 female CEX-Bus termination unit is
required and must be fitted to the last baseplate in the sequence. A TB851 female
CEX-Bus termination unit is supplied with each TK850 extension cable.
TK850 CEX-Bus Extension Cable
Only one TK850 CEX-Bus extension cable may be used in any one CEX-Bus.
Cable length: 0.7 m (2.3 ft).
Installing the CEX-Bus Interconnection Unit BC810/TP857
The BC810 units must be mounted directly to the CEX-Bus on the processor unit
base plate. The SM810, if used, and communication interfaces are then mounted to
the CEX-Bus on the BC810, and terminated in each end with TB850 male CEX-Bus
termination unit. The two BC810 are connected with the interconnection cable
TK851.
The maximum number of CEX-Bus units connected to a BC810 is six. The
primary function of BC810 is to divide the CEX-Bus into two physically separate
segments for increased system availability, a faulty CEX-Bus unit on one segment
will not affect the processor unit or the other CEX-Bus segment. It is also
important to note that when using the BC810 together with redundant CEX-Bus
units these units shall be mounted on different BC810 CEX-Bus segments.
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