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3-1 Mounting the Units
There is no single Unit that can be said to constitute a Rack PC. To 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 Unit. The CPU Unit contains the program consist-
ing of the series of steps necessary for the control task. The CPU Unit has a built-
in power supply, and fits into the rightmost position of the Backplane.
The CPU Unit 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 posi-
tion, and then release the yellow tab.
Mounting the Units Section 3-1
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