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CJ1W-CT021

Omron CJ1W-CT021 High-Speed Counter Unit 2-Channel 100kHz

SKU: CJ1W-CT021

USD 160.00

Omron CJ1W-CT021 is a 2-channel high-speed counter unit for CJ series PLCs, counting up to 100kHz for encoder and pulse input applications.

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Product Overview

CJ1W-CT021 belongs to Omron CJ1W special function lineup and is used where high-frequency pulse signals must be captured reliably. Typical applications include encoder pulse counting, speed measurement, position tracking events, and high-rate trigger accumulation beyond the capability of standard scanned digital inputs. This module is commonly selected in packaging, converting, and material-handling systems with fast-moving mechanisms. Engineering should validate pulse frequency range, signal conditioning, channel mapping, and synchronization with PLC program logic. Commissioning requires verification of scaling, reset behavior, and error-handling under realistic machine cycles. CJ1W-CT021 is generally chosen when modular CJ platforms need dependable high-speed counting without replacing the core controller architecture.

  • SKU: CJ1W-CT021
  • Series: CJ1W

Best-Fit Applications

  • Encoder pulse counting for machine position tracking
  • Speed monitoring on conveyors and feeders
  • High-rate trigger counting in packaging lines
  • Process event accumulation in production sequences
  • Retrofit enhancement of pulse acquisition capability
  • Synchronized measurement support in motion-adjacent tasks

Buying Checklist

  • Confirm pulse frequency range against real machine conditions.
  • Validate signal interface type and wiring practice.
  • Plan PLC scaling and diagnostic handling for counter values.
  • Use shielded routing to minimize noise-related miscounts.
  • Test reset and overflow behavior before production release.

Technical Specifications

Model CJ1W-CT021
Series CJ1W
Type High-Speed Counter Unit
Counter Channels 2 channels
Max Count Frequency 100kHz
Count Modes Incremental, differential, up/down
Input Types Line driver, open collector
Count Range -2147483648 to +2147483647 (32-bit)
Response Time 10μs
Functions Compare, pulse output, interrupt
Connection Removable terminal block
Current Consumption 150mA at 5VDC
Operating Temperature 0 to +55°C
Mounting CJ series backplane

FAQ for CJ1W-CT021

What encoders can I connect to this counter?
Incremental encoders with line driver (RS-422) or open collector output. Max frequency 100kHz. For higher frequency encoders, use CJ1W-NC position control unit.
What's the difference between incremental and differential mode?
Incremental: single input, counts rising edges. Differential: two inputs (A and B), counts based on phase relationship for direction detection. Differential provides direction information.
Can I use this for flow meter totalizing?
Yes, common application. Connect flow meter pulse output to counter input. Counter accumulates total flow. Use compare function for batch control or alarm at setpoint.
How do I reset the counter?
Software reset via PLC program (CNT instruction), or external reset input. External reset useful for manual reset without PLC intervention.

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