OMRON CJ1W-AD081-V1 Analog Input Module
The OMRON CJ1W-AD081-V1 is a high‑precision analog input module designed for the CJ1 series programmable logic controllers. This module provides eight independent analog input channels, each configurable for either voltage (±10 V, 0‑10 V, 0‑5 V) or current (4‑20 mA, 0‑20 mA) signals, making it exceptionally versatile for process control, machine monitoring, and data acquisition applications. The V1 suffix denotes enhanced performance, including improved noise immunity and faster conversion cycles.
Each channel features a 16‑bit resolution analog‑to‑digital converter, providing high granularity for precise measurement of temperature, pressure, flow, and level transmitters. The module employs isolated inputs to protect the PLC backplane from electrical disturbances commonly found in industrial environments. Its compact form factor allows up to several modules to be installed in a single rack, scaling easily with system requirements.
Technical Specifications
Number of channels: 8 (analog inputs)
Input signal ranges: ±10 V, 0‑10 V, 0‑5 V, 1‑5 V (voltage); 0‑20 mA, 4‑20 mA (current)
Resolution: 16 bits (1/65536) for all ranges
Conversion speed: 250 µs per channel (selectable averaging times)
Accuracy: ±0.2% of full scale (at 25°C), ±0.3% over full temperature range
Input impedance: ≥ 1 MΩ (voltage), ≤ 250 Ω (current, with built‑in burden resistor)
Isolation: Photo‑coupler isolation between inputs and PLC bus
Internal power consumption: 5 V DC, 120 mA (from backplane)
I/O allocation: 1 output word (control) and 2 input words (data) per channel grouping
Dimensions: 90 x 65 x 85 mm (H x W x D)
Operating temperature: 0°C to +55°C
Storage temperature: -20°C to +75°C
Functional Capabilities
Configurable input ranges: Each channel can be independently set via software (CX‑Programmer) for voltage or current, eliminating the need for hardware jumpers.
Digital filtering: Moving‑average filtering is provided per channel to suppress high‑frequency noise and stabilize readings.
Scale conversion: The module can automatically convert raw counts into engineering units (e.g., °C, kPa) without additional arithmetic in the PLC program.
Disconnection detection: The module detects open‑circuit conditions for current inputs and sets an alarm flag for faster troubleshooting.
Typical Application Scenarios
Process control loops: Reading 4‑20 mA signals from pressure and temperature transducers in chemical and pharmaceutical reactors.
Machine condition monitoring: Measuring vibration and temperature sensors on pumps and compressors.
Energy management: Monitoring power transducers for sub‑metering of plant utilities.
Test and measurement stations: Acquiring analog sensor data for quality inspection systems.
Integration with CJ1 Systems
Installation is straightforward: mount the CJ1W-AD081-V1 into any available slot in the CJ1 backplane. Automatic I/O allocation assigns memory addresses for control and data words. The CX‑Programmer software provides a dedicated configuration window for setting input ranges, filter values, and scaling parameters. The module supports the CJ series’ high‑speed interrupt function, allowing analog triggers to interrupt the CPU for immediate response to critical process conditions. Wiring is facilitated via removable terminal blocks, which are clearly labeled for each channel’s signal and common connections.
Environmental and Compliance
The module complies with EN 61131‑2 and carries CE and UL certifications (cULus). It is rated for pollution degree 2 and installation category II. The CJ1W-AD081-V1 is RoHS compliant and meets the EMC directive for industrial environments.
Conclusion
The OMRON CJ1W-AD081-V1 analog input module offers a balanced combination of channel density, accuracy, and configurability. Its robust design and advanced features make it a dependable choice for integrating real‑world analog signals into CJ1‑based automation systems, ensuring precise monitoring and control across diverse industrial processes.
