Product Description

The AAR181 is a high-precision, 16-channel isolated analog input module designed for Yokogawa FIO (Field network I/O) systems. It supports both voltage inputs (-10 to +10 V DC) and 4–20 mA current loops, making it a versatile interface for a wide range of field transmitters.

Unlike non-isolated modules, the AAR181 provides full channel-to-channel and channel-to-system isolation, protecting the control system from electrical noise, ground loops, or faults in one field circuit.

Engineered for high reliability and safety, the module is intrinsically safe (IS) compliant and supports dual-redundant configurations, making it ideal for mission-critical applications where downtime is unacceptable.

Technical Specifications

Application Scenarios

The AAR181 is widely deployed in high-integrity process control environments, including:

• Chemical reactors

• Offshore oil and gas platforms

• Gas processing and petrochemical plants

Its superior isolation makes it ideal for field signals from electrically noisy areas or distributed sensors with different grounding potentials.

Frequently Asked Questions

Why are empty slots required during installation?

• Each channel features high-power isolation circuitry that generates additional heat. Empty slots provide airflow and thermal dissipation, ensuring hardware reliability and long-term performance.

Can I mix voltage and current inputs on the same module?

• Yes. The hardware can handle both types, but proper wiring and DCS configuration are required to ensure each channel is correctly mapped to its respective sensor type.