Omron CJ1W-CT021 CJ Series High‑speed Counter Unit 2 Axes 500kHz

Omron CJ1W-CT021 is a high‑speed counter unit for CJ‑series PLC systems. Provides two 32‑bit counters with maximum input frequency up to 500 kHz (RS‑422 line driver) or 50 kHz (open‑collector). Supports simple, ring and linear counting modes. 40‑pin connector interface. DIN rail mounting.

Applications:

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

• Encoder feedback for conveyor tracking and material handling

• Rotation monitoring in rotary tables and indexing machinery

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

Core Specifications:

• Number of counters: 2 (32‑bit binary range)

• Number of digital inputs: 2 (external control inputs)

• Number of digital outputs: 2 (external outputs)

• Number of soft outputs: 30 (counter value zone comparisons, target comparisons, delays, holds)

• Max. input frequency (RS‑422 line driver): 500 kHz

• Max. input frequency (open‑collector): 50 kHz

• Input voltage (open‑collector): 5 V DC, 12 V DC, or 24 V DC

• Counting modes: simple, ring, linear

• Max. response time: 0.5 ms

• Current consumption: 5 V DC, 0.28 A

• Connection: 40‑pin solder‑type connector (socket Fujitsu FCN‑361J040‑AU included)

• Dimensions (W × H × D): 31 mm × 90 mm × 65 mm

• Weight: approx. 120 g

• Operating temperature: 0 °C … 55 °C

Advanced Specifications:

• Encoder input signals: phases A, B, Z

• Pulse rate measurement function

• Data logging

• Digital variable noise filter

• External control functions: open gate, close gate, preset, reset, capture, stop/capture/reset combinations, reset enable (total 16 functions)

• Counter outputs and external control inputs can trigger interrupt tasks in the CPU

• Supports phase differential, up/down pulse, pulse & direction input types

• External output functions: target value comparisons, zone comparisons, programmable outputs, hysteresis settings

• Allocation: 1 Special I/O Unit number, occupies words in Special I/O Unit DM Area

• Isolation: refer to product manual for isolation details

• Mounting: DIN rail (35 mm)

• Certifications: UC1, N, L, CE

Compatibility information:

• This unit belongs to the Omron SYSMAC CJ series.

• Compatible with CJ1, CJ2 and NJ series CPU units (some functions unavailable with NJ‑series – refer to product manual).

• Installs on CPU Rack or Expansion Rack via CJ I/O Bus.

• Includes two 40‑pin solder‑type connectors (socket and cover).

• Configured in CX‑Programmer (I/O Table and Unit Setup).

Related Products:

• Entry level – C200H‑CT021 (older CS1 series, lower specifications)

• Current model – CJ1W‑CT021 (2 axes, 500 kHz, 32‑bit, for CJ‑series)

• Higher channel count alternative – CJ1W‑CT041 (4 axes, 500 kHz)

• Connector‑terminal conversion unit – XW2D‑40G6 (40‑pin M3 screw terminals)

• Connection cables – XW2Z‑050B (0.5 m), XW2Z‑100B (1 m), XW2Z‑200B (2 m), XW2Z‑500B (5 m