The Omron CJ1W-CT021 is a high-speed counter unit designed for integration with CJ-series and NJ-series programmable logic controllers. It features two independent 32-bit counters capable of processing input pulse frequencies up to 500 kHz, making it suitable for precise high-speed motion control and positioning applications. The unit supports three counting modes: simple, circular (ring), and linear, offering flexibility for diverse industrial counting applications. It provides 2 digital inputs, 2 external digital outputs, and 30 internal software outputs with programmable logic including zone comparisons, target values, delays, and hysteresis. With a maximum response time of 0.5 ms from counter input to external output, it enables rapid closed-loop control. The unit includes a configurable digital noise filter (10 kHz or 50 kHz) and accepts multiple input voltage levels (5V, 12V, 24V line driver inputs). It mounts directly to CJ-series or NJ-series CPU racks or expansion racks. Item Details Brand Name: Omron Manufacturer: Omron Corporation Item Type Name: High-Speed Counter Unit Product Family / Series: CJ-series Model Number: CJ1W-CT021 Unit Type: Special I/O Unit Product Specifications number_of_counters: 2 counter_bit_range: 32-bit maximum_input_frequency: 500 kHz counting_modes: Simple, Circular (Ring), Linear digital_inputs: 2 digital_outputs: 2 external, 30 internal (software) external_control_inputs: 2 maximum_response_time: 0.5 ms noise_filter: Configurable (10 kHz or 50 kHz default) input_voltage_compatibility: 5 V, 12 V, 24 V line driver output_voltage_range: 12-24 V DC (10.2 to 26.4 V) output_switching_capacity: 46 mA at 10.2 V to 100 mA at 26.4 V (200 mA max per common) internal_current_consumption: 280 mA at 5 V DC ambient_operating_temperature: 0 to 55°C ambient_storage_temperature: -20 to 75°C ambient_operating_humidity: 10% to 90% without condensation cio_area_allocation: 40 words dm_area_allocation: 400 words (113 for settings, 287 available as work area) maximum_units_per_system: 24 Additional Details Mounting Position: CJ-series CPU Rack, CJ-series Expansion Rack, NJ-series CPU Rack, or NJ-series Expansion Rack Interrupt Task Support: External interrupt tasks supported with CJ1-H or CJ1M CPU Units (must be positioned within first 5 slots for CJ1-H, first 3 slots for CJ1M) Counter Type Selection: DIP switch on front panel (default: Simple Counter) Protection Features: Reverse polarity protection, insulated from I/O bus Measurements Weight: 100 g Dimensions: 31 × 90 × 65 mm (W × H × D)
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