Omron CJ1W-CT021 CJ1 Series High-speed Counter Unit

Description

To address demanding industrial applications requiring precise position and speed tracking, the CJ1W-CT021 high-speed counter module offers high-performance pulse detection for Omron CJ-series and NJ-series PLC systems. This module is designed to interface directly with incremental rotary encoders or linear scales, processing fast input pulses independently of the PLC CPU cycle time.

The unit features dual independent counting channels capable of handling high-frequency signals. It processes count operations, frequency measurement, and rotational speed calculation directly on-board, ensuring deterministic control for motion tracking, packaging machinery, and positioning tasks.

Features

• Dual independent high-speed counter channels.
• Accepts input pulse frequencies up to 500 kHz for high-resolution encoder feedback.
• Fast response time of 0.5 ms for rapid output activation based on counter comparison values.
• Direct integration into Omron CJ1 and NJ series controller backplanes.
• Low internal power consumption of 280 mA at 5 VDC.

Applications

• Rotary encoder interface for servo and stepper positioning systems.
• Web tensioning and material length measurement in packaging and printing lines.
• Cut-to-length and flying shear control.
• High-accuracy speed monitoring in material handling and conveyor networks.

Technical Specifications

Installation Guidelines

When installing the counter unit, ensure it is locked securely onto the CJ1/NJ bus connector. To prevent electrical noise interference on high-frequency signals, always use shielded twisted-pair cabling for all encoder connections and ensure the shield is grounded at the PLC end. Route signal lines away from high-voltage AC power lines and variable frequency drives.