2 System Configuration
2-12
NJ-series CPU Unit Hardware User’s Manual (W500)
Models of Configuration Units
The Configuration Units with which the NJ-series CPU Unit can exchange data are classified into
three groups. The number of Units that can be mounted depends on the type of Unit.
Units Description
Unit identifica-
tion method
Number of
mountable Units
Basic I/O Units Basic I/O Units are used for discrete inputs and
outputs.
Identified by the
CPU Unit accord-
ing to mounting
position.
Up to 40 Basic I/O
Units can be
mounted.
Special I/O Units Special I/O Units are more advanced than Basic
I/O Units. They support functions other than dis-
crete inputs and outputs.
Examples:
Analog I/O Units and High-speed Counter Units
Special I/O Units have a smaller area for
exchanging data with the CPU Unit than CPU
Bus Units (including Network Communications
Units).
Identified by the
CPU Unit using
unit numbers 0 to
95 set with the
rotary switches on
the front panel of
the Unit.
Up to 40 Special
I/O Units can be
mounted.
(Depending on the
model, 1 to 4 unit
numbers are used
for one Unit.)
CPU Bus Units CPU Bus Units are advanced Units that
exchange data with the CPU Unit via the CPU
bus.
Examples:
Network Communications Units and Serial Com-
munications Units
CPU Bus Units have a larger area for exchang-
ing data with the CPU Unit than Special I/O
Units.
Identified by the
CPU Unit using
unit number 0 to F
set with the rotary
switch on the front
panel of the Unit.
Up to 16 CPU Bus
Units can be
mounted.
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