OMRON CJ1W-CT021

OMRON CJ1W-CT021

Product Introduction: The CJ1W-CT021 is a high-performance high-speed counter unit for the OMRON CJ series PLC. It is designed to count high-frequency pulses from encoders and other sensors, enabling precise position and speed control.

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Description

OMRON CJ1W-CT021

Technical Specifications:

  • Brand: OMRON
  • Model: CJ1W-CT021
  • Product Type: High-Speed Counter Unit
  • Compatible System: CJ / NJ Series PLC
  • Number of Counters: 2 counters
  • Max Input Frequency: 500 kHz (Linear driver), 50 kHz (Open collector)
  • Count Range: 32-bit binary (Linear/Arc mode)
  • Input Voltage: 5 VDC, 12 VDC, or 24 VDC
  • Response Time: 0.5 ms max.
  • Digital Inputs: 2 points (Control inputs)
  • Digital Outputs: 2 points (External outputs)
  • Soft Outputs: 30 points
  • Power Consumption: 280 mA at 5 VDC
  • Dimensions: 31 mm (W) × 90 mm (H) × 65 mm (D)

Functional Features:

  • 2 independent 32-bit counters
  • High-speed input up to 500 kHz
  • Supports Linear Driver (RS-422) and Open Collector inputs
  • Multiple counting modes: Simple, Ring, Linear
  • Pulse rate measurement function
  • Interrupt task generation for high-speed response
  • Noise filter settings (10 kHz, 50 kHz, 500 kHz)

Application Scenarios:

  • Rotary encoder counting
  • Conveyor speed monitoring
  • Positioning control
  • Length measurement
  • Packaging machine control

Performance Parameters:

  • Counter Channels: 2
  • Max Frequency: 500 kHz
  • Count Range: 32-bit
  • Response Time: 0.5 ms

Material Composition:

  • High-speed digital logic components
  • Multi-layer printed circuit board
  • Plastic housing
  • Connector terminals

Structural Features: The unit features a compact 31mm width. It includes connectors for high-speed pulse inputs and digital I/O. DIP switches are provided for selecting counter modes.

Working Principle: The unit receives high-frequency pulse signals from encoders. It counts these pulses using dedicated hardware counters, independent of the CPU scan time. It can compare counter values against preset targets to trigger outputs or interrupts.

Installation Requirements:

  • Mount on CJ series CPU rack or expansion rack
  • For interrupt tasks, install within 3 positions to the right of the CJ1M CPU
  • Use shielded twisted-pair cables for encoder connections
  • Ensure proper grounding

Usage Notes:

  • Select the correct input voltage (5V, 12V, 24V) for the connected encoder.
  • Do not exceed the maximum input frequency.
  • Digital outputs do not have short-circuit protection; ensure load currents are within limits.

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