1 Introduction
1-8
CJ-series High-speed Counter Units Operation Manual for NJ-series CPU Unit(W492)
1-3-2
Functional Specifications
Item
CJ1W-CT021
Number of Counters
2
Counter Type
• Simple Counter (refer to 3-2-1 Simple Counter)
• Circular Counter (refer to 3-2-2 Circular Counter)
• Linear Counter (refer to 3-2-3 Linear Counter)
The Counter Type can be chosen by DIP switch at the front of the Unit. By default the
Counters are set to Simple Counter (refer to 2-1-3 Counter Type Switch).
Maximum Input Frequency
500 kHz, refer to 1-3-3 Input Specifications for details
Maximum Response Time
0.5 ms (refer to A-3 Description of the Response Time)
Signals per Counter
Phase A, B and Z
Digital I/O
• 2 Digital Inputs (I0 and I1):
Every Digital Input can be assigned to a Counter. In this way one Counter can be con-
trolled by a maximum of 2 Digital Inputs (refer to 3-4 Digital Input Functions)
• 2 Digital Outputs (O0 and O1):
The Unit Output Pattern represents the 2 Digital Outputs and 30 Soft Outputs (refer to
3-5 Output Control).
Input Signal Types
• Phase Differential (multiplication x1), (multiplication x2)* and (multiplication x4)*
(refer to 3-3-1 Phase Differential)
• Up/Down* (refer to 3-3-2 Up & Down Pulse)
• Pulse & Direction* (refer to 3-3-3 Pulse & Direction)
Counter Control using I/O ports
• Open Gate/Start Counter: Counter is enabled to count pulses
• Close Gate/Stop Counter: Counter is disabled to count pulses
• Preset Counter: Preset Value can be saved.
• Reset Counter to zero
Refer to 3-4 Digital Input Functions.
Digital Input Functionality
• Gate*
• Reset*
• Preset*
• Enable Reset*
• Disable Reset*
For every Function the corresponding action can be triggered on a rising- or on a falling
edge (refer to 3-4 Digital Input Functions).
Output Control Mode
Automatic ON/OFF output according to the following three modes:
• Range Mode * (refer to 3-5-1 Range Mode)
• Comparison Mode * (refer to 3-5-2 Comparison Mode)
• Manual output control (refer to 3-5-3 Manual Output Control)
Output State Control
You can select the method to control the state of 32 outputs for when the CPU Unit
operating mode is changed from RUN to PROGRAM, or when an I/O bus check error or
an overflow/underflow error occurs.
- Continue updating output states automatically.
- Hold the output states.*
- Bring the pre-defined output state.*
Refer to 3-5-4 Output Control Configuration.
Output Driver Configuration
The Output Driver of every Digital Output can be configured as:
• NPN
• PNP*
Refer to 3-5-4 Output Control Configuration.