ABB AI625 (3BHT300036R1) Analog Input Module Overview

Brand Background

ABB is a global leader in electrification, industrial automation, robotics, and motion control solutions. Within process automation, ABB’s Distributed Control Systems (DCS)—such as the Advant OCS (Open Control System) with Master Software and Advant Controllers—are widely recognized for delivering robust process control, high uptime, and long-term operating durability across heavy processing industries worldwide.

Model Overview: AI625 (Part Number: 3BHT300036R1)

The ABB AI625 (Catalog / Part Number: 3BHT300036R1) is a high-density 16-channel Analog Input Module belonging to the ABB S600 I/O system family.

Engineered for integration into ABB Advant OCS platforms (such as Advant Controller 160), the AI625 serves as an analog measurement interface card. It receives current signals from up to 16 industrial field sensors and process transmitters, converts the analog measurements into high-fidelity digital signals, and transmits them across the system backplane to central controllers for closed-loop execution.

ABB AI625 3BHT300036R1 Analog Input Module

Key Technical Specifications and Parameters

• Manufacturer: ABB

• System Family: S600 I/O System / Advant OCS System

• Model Name / Designation: AI625

• Part / Ordering Number: 3BHT300036R1

• Product Type: High-Density Analog Input Module

• Number of Channels: 16 channels

• Input Signal Type: Current inputs ($0\text{ to }20\text{ mA}$, $4\text{ to }20\text{ mA}$)

• Analog Resolution: 12-bit A/D conversion

• Internal Input Shunt: $100\ \Omega$ built-in precision shunt resistor

• Common Mode Voltage (CMV): $50\text{ V}$

• Common Mode Rejection Ratio (CMRR): $> 100\text{ dB}$

• Galvanic Isolation: Galvanically isolated as one group

• Dimensions & Weight: Net Weight approx. 1.225 kg; Net Volume approx. $0.003\text{ m}^3$

Operating Industries

The ABB AI625 analog input module is deployed across continuous-process and industrial automation facilities powered by ABB Advant control architectures:

• Power Generation & Utilities: Thermal power plants, nuclear facilities, combined-cycle power units, and auxiliary boiler systems.

• Oil, Gas & Petrochemicals: Upstream oil platforms, refineries, petrochemical processing facilities, and gas compression stations.

• Chemical & Process Industries: Continuous chemical synthesis, batch manufacturing, and chemical transport networks.

• Pulp & Paper: Papermaking machine lines, chemical recovery boilers, pulpers, and digesters.

• Metals & Mining: Steel production mills, smelter operations, mineral processing, and heavy conveyor installations.

• Water & Wastewater Treatment: High-capacity water treatment infrastructure and regional pumping networks.

Common Usage Scenarios

1. High-Density Signal Acquisition

   Gathering continuous 4–20 mA current signals from up to 16 process instruments—such as pressure, level, flow, and temperature transmitters—into a single compact module slot.

2. DCS Controller Feedback Loops

   Sending real-time digital current values over the S600 backplane to Advant Controllers (e.g., AC 160) to execute proportional-integral-derivative (PID) control algorithms.

3. Auxiliary Plant Monitoring & Safety Protection

   Interfacing with vibration monitors, position indicators, and gas detectors to ensure continuous safety limit verification across critical plant equipment.

4. S600 I/O Rack Expansion

   Operating within S600 I/O expansion chassis to scale analog channel capacity near field junction boxes, reducing multi-core wiring cabling costs back to central control rooms.