3G5A2-RPT01-PE datasheet(55/182 Pages) OMRON

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If we want to include more than ten Units in our configuration, we can add an

additional Rack by mounting an I/O Control Unit to the leftmost slot of the CPU

Rack.

I/O Control Unit

Now we can use a cable to connect the CPU Rack to another Rack. This Rack

has a Power Supply Unit and I/O Units mounted to it, but it has no CPU of its own.

The additional Rack must also have an I/O Interface Unit mounted to its leftmost

slot to allow communications between the additional Rack and the CPU Rack.

The Backplane, Power Supply Unit, I/O Interface Unit, and other Units are col-

lective called an Expansion I/O Rack or an Expansion CPU Rack. The differ-

ences between the various types of Rack and the types of Systems they can be

used in are described in earlier sections of this manual. A CPU Rack connected

to a single Expansion I/O Rack is shown below.

I/O Interface Unit

CPU Rack

Expansion I/O Rack

The CPU Rack and Expansion I/O Rack shown above are connected by a cable

via the I/O Control Unit and I/O Interface Unit. It is possible to keep adding Ex-

pansion I/O Racks in this way until the maximum number of I/O points for the

system is reached. Each Expansion I/O Rack requires an I/O Interface Unit, al-

though a single Expansion I/O Rack can be connected by directly connecting the

CPU and Expansion I/O Backplanes, as described in an earlier section.

Assembly

Section 3-1

3G5A2-RPT01-PE Datasheet(PDF) 55 Page - Omron Electronics LLC