Yokogawa AAM11-S2 High-Precision AI Module | Isolated Analog Input for CENTUM CS/VP

Brand ABB

Model Yokogawa AAM11-S2

Product Overview

The Yokogawa AAM11-S2 is a high-precision current/voltage analog input module designed for Yokogawa CENTUM distributed control systems. It serves as the primary interface between field instrumentation and the DCS, converting continuous analog signals from transmitters, sensors, and process devices into digital values that the control system can monitor, record, and use for closed-loop control. The module accepts industry-standard current and voltage inputs, making it suitable for a wide range of measurement applications across process industries.

The Yokogawa AAM11-S2 provides eight isolated analog input channels and supports software-selectable signal types, including 4–20 mA and 0–20 mA current loops as well as 1–5 V and 0–10 V voltage signals. Its integrated transmitter power supply allows direct connection of two-wire transmitters without requiring a separate loop power source. With high input accuracy, low temperature drift, and galvanic isolation between the field side and system electronics, the module delivers stable and reliable measurement performance even in electrically demanding industrial environments.

As a revision “S2” variant of the AAM11 series, the Yokogawa AAM11-S2 is commonly deployed in CENTUM CS, CENTUM CS 3000, CENTUM CS 1000, and CENTUM VP systems. It is typically installed in an I/O module nest or adapter unit and communicates with the field control station through the system backplane. For plants maintaining legacy Yokogawa automation infrastructure, the module represents an important spare and replacement component that helps preserve measurement accuracy, system availability, and long-term operational continuity.

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	AAM11-S2
Manufacturer	Yokogawa Electric Corporation
Product Type	Current/Voltage Analog Input Module
Compatible Systems	CENTUM CS, CS 1000, CS 3000, CENTUM VP
Input Channels	8 channels
Current Input Signals	4–20 mA DC, 0–20 mA DC
Voltage Input Signals	1–5 V DC, 0–10 V DC
Current Input Impedance	250 Ω
Voltage Input Impedance	1 MΩ
Measurement Accuracy	±0.05% FS at 25°C
Temperature Drift	±8 ppm/°C
Isolation Rating	1500 V AC for 1 minute
Transmitter Supply	25 V DC, 60 mA maximum
Data Update Period	50 ms
Power Consumption	≤46 mA at 24 V DC; ≤10 mA at 5 V DC
Mounting Method	I/O module nest or adapter unit
Operating Temperature	-20°C to +60°C
Dimensions	76 × 25 × 178 mm
Weight	Approximately 0.08 kg
Country of Origin	Japan

Main Features and Advantages

Flexible current and voltage signal support

The Yokogawa AAM11-S2 accepts multiple standard analog signal types, including 4–20 mA, 0–20 mA, 1–5 V DC, and 0–10 V DC. Input ranges can be selected through engineering configuration, allowing the same module to interface with temperature transmitters, pressure transmitters, flowmeters, level instruments, analyzers, and other analog field devices. This flexibility reduces the need for multiple specialized I/O card types within a control cabinet.

Integrated transmitter power supply

The Yokogawa AAM11-S2 includes an internal transmitter power output of approximately 25 V DC with a maximum loop current of 60 mA. This enables direct connection of conventional two-wire 4–20 mA transmitters without requiring an external power supply for each instrument loop. The integrated supply simplifies wiring and reduces panel hardware in distributed I/O installations.

High accuracy and low drift

With a typical measurement accuracy of ±0.05% of full scale at 25°C and a low temperature drift of ±8 ppm/°C, the Yokogawa AAM11-S2 is well suited to precision process measurement. Stable analog-to-digital conversion helps maintain consistent control loop performance, even when ambient temperatures vary inside the control cabinet.

Galvanic isolation for signal integrity

The module provides galvanic isolation between field input circuits and system-side electronics, with a dielectric withstand rating of 1500 V AC for one minute. This isolation helps suppress ground loops, common-mode voltage differences, and electrical noise, protecting the DCS backplane and improving measurement reliability in high-interference environments.

Eight-channel density and compact design

Eight input channels in a slim module format allow the Yokogawa AAM11-S2 to support multiple measurement points while minimizing rack space. Its lightweight, compact design simplifies handling and installation in high-density I/O cabinets.

Broad CENTUM system compatibility

The Yokogawa AAM11-S2 is compatible with multiple Yokogawa CENTUM platforms, including legacy CS-series systems and later CENTUM VP architectures. This compatibility makes it an important component for system life-cycle management, retrofit projects, and emergency replacement of failed analog input modules.