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The figure below shows one I/O Unit mounted directly to the left of the CPU Unit.
I/O Units are where the control connections are made from the PC to all the vari-
ous input devices and output devices. As you can see from the figure above,
there is still some space available on the left side of the Backplane. This space is
for any additional I/O Units that may be required.
The figure above shows a total of eight I/O Units mounted to the Backplane. I/O
Units come in five shapes; A-, B-, C-, D-, and E-shapes (refer to Appendix B
Specifications for dimensions). Normally, only A-shape I/O Units can be
mounted to the two rightmost I/O Unit positions on the Backplane (the ones next
to the CPU Unit). This is so that there will be enough room to mount peripheral
devices such as a Programming Console to the CPU Unit. However, if you use a
Programming Console Base Unit to increase the mounting height of the Pro-
gramming Console, you will be able to mount the Programming Console to the
CPU Unit even if there are other-shape I/O Units mounted to the two rightmost
slots.
When using 16-point Output Units (C200H-OC225/OD212/OD21A) and B7A
Interface Unit (C200H-B7AO1), mount them to a C200H-BCjj1-V1/V2 Back-
plane. If a Backplane other than this model is used, the Units will not operate
properly.
Backplanes are available in different lengths (three, five, eight, ten slots), and
can hold a different number of I/O Units accordingly (refer to Appendix B Specifi-
cations for dimensions). Of course, not all I/O Units look exactly alike, but the
ones in the figure show their typical appearance. This configuration of Back-
plane, CPU Unit, and I/O Units is called a CPU Rack. This term refers to the
Backplane and all the Units mounted to it. However, if we want to include more
than eight I/O Units in our configuration we can add an additional Backplane.
Mounting the Units Section 3-1
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