2 Basic System Configuration and Devices
2-4
CJ2 CPU Unit Hardware User’s Manual
Although the CJ-series PLCs do not require Backplanes, the term “slot” is still used to refer to the rela-
tive position of a Unit in the Rack. Slot numbers increase toward the right side of the Rack.
Name Configuration Remarks
CJ-series
CPU Rack
CPU Unit CJ2H CPU Units One required for every CPU Rack.
CJ2M CPU Units One required for every CPU Rack.
Pulse I/O Mod-
ule (Can be
connected only
with a CJ2M
CPU Unit.)
Connected to use pulse I/O.
Up to two Pulse I/O Modules can be connected. They must be con-
nected to the immediate left of the CPU Unit. The Pulse I/O Mod-
ule closest to the CPU Unit is Pulse I/O Module 0 and the other
one is Pulse I/O Module 1.
Serial Option
Board (Can be
mounted only
with the CJ2M-
CPU3@.)
One Serial Option Board can be mounted in the CJ2M-CPU3@.
Memory Card Install as required.
CJ-series Power Supply Unit One required for every CPU Rack.
I/O Control Unit Required to connect an Expansion Rack. Must be connected
immediately to the right of the CPU Unit.
Configu-
ration
Units
CJ-series Basic
I/O Units
A total of up to 10 Units can be connected to the CPU Rack and to
each of the Expansion Racks. (An error will occur if 11 or more
Units are connected.)
CJ-series Special
I/O Units
CJ-series CPU
Bus Units
End
Cover
Must be connected to the right end of the CPU Rack. One End
Cover is provided with the CPU Unit.
A fatal error will occur if the End Cover is not connected.
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