PLCs, Power Supplies & Others

The Yokogawa AAI141 is a 16-channel analog input module designed for high-density signal acquisition in CENTUM CS 3000 and CENTUM VP distributed control systems. This module accepts standard 4–20 mA current or 1–5 V DC input signals. It delivers exceptional channel count per slot for space-constrained applications.

Key Technical Specifications

Sixteen Inputs in Single-Slot Form Factor

The AAI141 packs sixteen analog input channels into one standard 45 mm wide housing. You therefore maximize I/O density within your ESB or ER bus node racks. This density proves invaluable for large-scale continuous processes. You accommodate more field signals without expanding cabinet footprint.

Flexible Signal Type Configuration

You configure each AAI141 module for either 4–20 mA current or 1–5 V DC input. Current mode presents 250 ohm input resistance to the loop. Voltage mode offers one megohm impedance for minimal circuit loading. This flexibility allows one module type to serve multiple application requirements.

One Hundred Samples per Second Throughput

The AAI141 digitizes all sixteen channels at 100 samples per second. You therefore receive fresh process data every 10 milliseconds. This sampling rate supports most temperature, pressure, and flow monitoring applications. Fast-acting loops still receive adequate update frequency for stable control.

Non-Isolated Architecture for Cost-Effective Scaling

This module employs non-isolated channel design to achieve high channel density. You therefore install the AAI141 in applications sharing common ground references. All sixteen inputs reference the same analog common rail. This architecture significantly reduces per-channel cost.

Application Suitability and Limitations

The AAI141 suits general-purpose monitoring in grounded signal environments. You should avoid this module where large ground potential differences exist. Similarly, install isolated modules like the AAI135 for circuits with separate reference potentials. The AAI141 delivers maximum value in unified grounding systems.

Mechanical and Environmental Specifications

Yokogawa rates this module for continuous operation from -10 °C to +55 °C. Storage tolerance extends from -40 °C to +85 °C during transport. The 0.3 kilogram weight simplifies handling during installation and replacement. MIL connector and pressure clamp options accommodate various wiring preferences.

System Compatibility and Integration

The AAI141 integrates directly into CENTUM VP and CS 3000 control systems. You mount the module in any ESB or ER bus node slot. The system automatically recognizes the module upon insertion. Field wiring terminates at the node unit without intermediate junction boxes.

Power Supply Requirements

This module consumes 300 milliamps from the 5 V DC logic supply. Additionally, it draws 200 milliamps from the 24 V DC field power source. You must verify sufficient node power capacity before installation. The AAI141 requires both supplies for proper operation.

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