3-1SectionMounting the Units
24
3-1 Mounting the Units
There
is no single Unit that can be said to constitute a Rack PC. T
o build a Rack
PC, we start with a Backplane. The
Backplane for the C200H is shown below
.
C200H Backplane
The Backplane is a simple device having two functions. The first is to provide
physical
support for the Units to be mounted to it. The second is to provide the
connectors and electrical pathways necessary for connecting the Units
mounted to it.
The
core of the PC is the CPU. The CPU contains the program
consisting of the
series
of steps necessary for the control task.
The CPU has a built-in power sup
-
ply, and fits into the rightmost position of the Backplane.
The
CPU of the C200H has no I/O points built in. So, in order to complete the PC
we
need
to mount one or more I/O Units to the Backplane. Mount the I/O Unit to
the
Backplane by locking the top of the I/O Unit into the
slot on the Backplane and
rotating
the I/O Unit downwards as shown in the following diagram. Press down
on
the yellow tab at the bottom of the slot, press the I/O Unit firmly into position,
and then release the yellow tab.
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