CJ1W-CT021 High-Speed Counter Unit 2 Axes 500kHz | Omron

The Original New Omron CJ1W-CT021 High-Speed Counter Unit is a Special I/O Unit for SYSMAC CJ-series PLCs, designed for high-precision position and speed measurement in industrial automation systems. It features two independent 32-bit counters capable of accepting input pulse frequencies up to 500 kHz [0†L7][2†L5][5†L15]. Supporting incremental encoder signals via RS-422 line driver or open-collector inputs, this unit is ideal for motion control, positioning, and high-speed counting applications.

Core Engineering Highlights:
2 independent 32-bit counters | 500 kHz maximum input frequency | RS-422 line driver or open-collector input | 2 external control inputs + 2 external outputs + 30 internal soft outputs | 0.5 ms maximum response time [1†L24-L25][6†L33] | Simple, circular, and linear counting modes | Digital variable noise filter | 0.28 A current consumption [5†L14] | 31 mm width [6†L9] | 100 g weight [6†L9] | CE, cULus, NK, Lloyd's certified [5†L15]

Key Features:

• Original New Omron CJ1W-CT021 module

• 2 independent 32-bit counters (simple, circular, or linear modes selectable via DIP switch) [6†L30-L33]

• Maximum input frequency: 500 kHz (RS-422 line driver) / 50 kHz (open-collector) [0†L7][5†L14]

• Input signals: Phase A, B, and Z (incremental encoder) [6†L34]

• RS-422 line driver and open-collector input support (5 V, 12 V, 24 V) [0†L6][5†L13-L14]

• 2 external control inputs (I0, I1) and 2 external outputs (O0, O1) [6†L34-L37]

• 30 internal soft outputs for advanced control patterns [3†L8][6†L37-L38]

• Maximum response time: 0.5 ms (counter input to external output) [1†L24-L25][6†L33]

• Digital variable noise filter for reliable counting in noisy environments [2†L6]

• Counting modes: phase differential (×1, ×2, ×4), up/down, pulse & direction [6†L38-L40]

• Counter control via CIO software bits: gate, preset, reset, capture, stop/capture/reset [6†L40-L43]

• Occupies 40 words in Special I/O Unit (CIO) Area and 400 DM words [9†L13-L15]

• 40-pin solder-type connector included (Fujitsu FCN-361J040-AU) [5†L24-L26]

• 31 mm width for space-saving installation in CJ-series racks [6†L9]

Applications:

• High-speed position and length measurement on packaging and converting lines

• Encoder feedback for conveyor tracking and material handling

• Speed monitoring and rotation counting in rotary tables and indexing machinery

• High-precision motion control applications requiring 32-bit counting range

• Automated assembly and positioning systems

• Legacy system upgrades and spare part replacement for CJ-series configurations

Technical Specifications:

System Compatibility:

• Compatible with Omron SYSMAC CJ-series CPU units (CJ1, CJ2)

• Compatible with NJ-series CPU units (some functions unavailable – refer to manual) [5†L16-L23]

• Installs on CJ-series CPU Rack or CJ-series Expansion Rack via CJ I/O Bus [6†L10]

• For external interrupt task functionality: unit must be placed within 5 positions of CJ1-H CPU or 3 positions of CJ1M CPU [9†L9-L12]

• Requires 40-pin connector cable and terminal block conversion units for field wiring (sold separately) [5†L34-L39]

Related Products:

• XW2D-40G6 – 40-pin connector-terminal block conversion unit (M3 screw terminals) [5†L39]

• XW2Z-050B / 100B / 200B / 500B – Connecting cables (0.5 m to 5.0 m) [5†L36-L38]

• CJ1W-ID211 – 16-point DC input unit (for general-purpose inputs)

• CJ1W-OD211 – 16-point transistor output unit (for general-purpose outputs)

• CJ2M-CPU32 – CJ2M CPU unit with built-in EtherNet/IP

• CJ1W-PA205R – Power supply unit for CJ-series CPU rack

PLC ERA is an independent industrial automation distributor supplying genuine Original New products through established global supply channels. All products are factory sealed when applicable and undergo quality inspection prior to shipment. Omron, SYSMAC, and CJ-series are trademarks of Omron Corporation.