SKU: CJ1W-CT021
Omron CJ1W-CT021 High-Speed Counter Unit 2-Channel 100kHz
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.
USD 160.00 per unit, volume discounts available
- In stock, ships in 24h
- 100% genuine Omron
- 1-year manufacturer warranty
- Worldwide delivery
Key Features
- CJ1W high-speed counter special function module
- Supports high-frequency pulse acquisition tasks
- Suitable for encoder/event counting applications
- Extends CJ platform capability beyond standard digital inputs
- Useful for high-throughput machinery and conversion lines
- Supports robust commissioning with channel diagnostics
High-Speed Pulse Counting in CJ Modular PLC Systems
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.
Typical 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 |
Frequently Asked Questions
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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