Omron NJ501-1400 User Manual page 74

2 System Configuration
 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
Basic I/O Units
Special I/O Units
CPU Bus Units
2-12
Description
Basic I/O Units are used for discrete inputs and
outputs.
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).
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.
Unit identifica-
tion method
Identified by the
CPU Unit accord-
ing to mounting
position.
Identified by the
CPU Unit using
unit numbers 0 to
95 set with the
rotary switches on
the front panel of
the Unit.
Identified by the
CPU Unit using
unit number 0 to F
set with the rotary
switch on the front
panel of the Unit.
NJ-series CPU Unit Hardware User's Manual (W500)
Number of
mountable Units
Up to 40 Basic I/O
Units can be
mounted.
Up to 40 Special
I/O Units can be
mounted.
(Depending on the
model, 1 to 4 unit
numbers are used
for one Unit.)
Up to 16 CPU Bus
Units can be
mounted.