Product Overview

The OMRON CJ1W-AD081-V1 is a high density analog input unit designed for CJ series Programmable Logic Controllers (PLCs). This module converts analog signals from field instruments such as pressure transmitters, temperature sensors, flow meters, and level transducers into digital values that the CPU can process. Supporting both voltage and current inputs, the CJ1W-AD081-V1 eliminates the need for external signal conditioners, isolators, and scaling hardware by integrating these functions directly on the module.

With 8 independent input channels, the module offers significant I/O density in a single slot, reducing overall chassis requirements and simplifying system architecture. The unit is capable of accepting standard industrial signal ranges including 1 to 5 V, 0 to 5 V, 0 to 10 V, and 4 to 20 mA, and includes a removable terminal block for simplified wiring and maintenance.

Technical Specifications

Key Features

• Eight analog input channels in a single slot, maximizing I/O density and reducing control cabinet footprint.

• Accepts both voltage (0 to 10 V, 0 to 5 V, 1 to 5 V) and current (4 to 20 mA) signals, covering most industrial sensor output types without external converters.

• Built in scaling function converts raw digital values directly into engineering units (e.g., PSI, °C, L/min) without ladder programming, saving program memory and scan time.

• Provides functionality of external signal conditioners, isolators, and power supplies, reducing component count and installation cost.

• Integrated functions include measurement value alarms, rate of change calculations, and square root extraction for differential pressure flow measurement.

• High noise immunity with AG terminals connecting to analog circuit 0 V reference, and recommendations for shielded input wiring to further improve signal integrity.

• Removable terminal block allows field wiring to be completed before module installation and simplifies module replacement.

• UC1 and CE certification ensures compliance with European and international industrial standards.

Applications

The CJ1W-AD081-V1 analog input module is deployed in process and manufacturing applications where monitoring of continuous process variables is required. Typical applications include water and wastewater treatment plants monitoring flow, level, and pressure; chemical processing facilities reading temperature transmitters and pH probes; and HVAC systems measuring duct static pressure, supply air temperature, and chilled water flow.

In manufacturing, the module captures analog feedback from servo amplifiers, variable frequency drives, and hydraulic pressure sensors for closed loop process control. Its built in scaling and math functions make it suitable for tank level monitoring, where square root extraction provides accurate flow calculation from differential pressure transmitters. Combined with CJ series CPU units and other I/O modules, the CJ1W-AD081-V1 enables complete process monitoring and control systems without requiring dedicated process controllers or additional PLC racks.