1-5
1 Introduction
CJ-series High-speed Counter Units Operation Manual for NJ-series CPU Unit(W492)
1-2 Basic C
o
n
figu
ratio
n
1
1-2
Basic Configuration
z
Mounting Restrictions
The CJ1W-CT021 High-speed Counter Unit is a Special I/O Unit that belongs to the CJ Series.
The CJ1W-CT021 High-speed Counter Unit can be mounted in an NJ-series CPU rack or NJ-series
Expansion Rack.
Note If you want the CJ1W-CT021 High-speed Counter Unit to generate interrupts to activate
external interrupt tasks in a CJ1-H CPU Unit, the Counter Unit must be in one of the five posi-
tions immediately to the right of the CJ1-H CPU Unit on the CPU Rack. If you want the High-
speed Counter Unit to generate interrupts to activate external interrupt tasks in a CJ1M CPU
Unit, the Counter Unit must be in one of the three positions immediately to the right of the
CJ1M CPU Unit on the CPU Rack.
No external interrupt tasks can be activated in CJ1-H or CJ1M CPU Units if the CJ1W-CT021
Push Bu tton
Proximity Switch
Other Sensors
Limit Switch
Photo Electric
Sensor
Typical applicable Sensors for Digital Inputs:
Relais
Motor Interface
ON/OFF
High/Low Speed
Forward/Reverse
Brake O N/OFF
M
Other Actuators
Lamp
Typical applicable Actuators for Digital Outputs:
Incremental
Encoder
Proximity Sensor
Other P ulse
Generators
Typical applicable Pulse Generators for
Counter Inputs: