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Section
3-1
Mounting the Units
The figure below shows one I/O Unit mounted directly to the left of the CPU.
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 three shapes; A-shape, B-shape, and E-shape (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). This is so that there will be enough room to mount peripheral de-
vices such as a Programming Console to the CPU. However, if you use a Pro-
gramming Console Base Unit to increase the mounting height of the Program-
ming Console, you will be able to mount the Programming Console to the CPU
even if there are B-shape and/or E-shape I/O Units mounted to the two rightmost
slots.
The C200H-OC225/OD212/OD21A 16-point Output Unit and C200H-B7AO1
B7A Interface Unit can be mounted only to a C200H-BC
1-V1/V2 Backplane.
If a Backplane other than these two models 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, and I/O Units is called a CPU Rack. This term refers to the Back-
plane 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.
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