ABB AI845 3BSE023675R1 8-Channel HART Analog Input Module

AI845 3BSE023675R1 is an 8-channel single-ended analog input module of ABB S800 I/O series, matching System 800xA AC800M DCS platform. It collects standard 4–20mA / 0–5V analog signals from field transmitters, converts analog values into digital data and transmits to controllers. Built-in HART pass-through function supports two-wire HART instruments for remote parameter reading and adjustment.

This module supplies limited current power for field transmitters and carries comprehensive channel fault diagnosis. It supports single or redundant installation, hot-swap replacement without rack power-off, and pairs with TU810/TU845 series terminal units for field wiring. Widely stocked as spare parts for power, chemical and water treatment DCS signal acquisition cabinet maintenance and expansion projects.

Main Specifications

• Brand: ABB; Model: AI845, Part No.: 3BSE023675R1
• Channel: 8 single-ended unipolar input channels, 1 group ground isolation (50V rated)
• Signal range: 0–20mA, 4–20mA, 0–5V DC, 1–5V DC; 12-bit conversion resolution
• Core function: HART pass-through communication, independent current-limited transmitter power supply per channel
• Power consumption: Max 3.5W; dimension: 119mm(H) × 45mm(W) × 102mm(D), weight ~0.2kg
• Installation mode: Single-slot rack mounting, support redundant pairing, full hot-swap compatible
• Diagnosis: Detect loop open-circuit, short-circuit, module failure with front LED status indicators
• Operating temp: 0℃ ~ +60℃, CE/UL industrial certification, RoHS compliant
• Matching accessories: TU810, TU814, TU845 terminal base units for field wiring
• Application: Spare replacement for industrial DCS field analog signal acquisition hardware

Core Functions

• Collect analog signals from pressure, flow, temperature HART transmitters and convert to digital values for AC800M controller processing
• Provide stable limited current power to two-wire and three-wire field transmitters, monitor power supply abnormity in real time
• HART transparent transmission enables upper system to read instrument tag, calibration data, fault alarms without additional communication lines
• Single-group isolation eliminates ground loop interference caused by multi-point grounding of field sensors in complex factory wiring
• Independent channel protection: automatically lock faulty channel when short-circuit occurs to avoid damaging the whole module
• Hot-swap design allows online module replacement without stopping other measurement loops on the same rack
• Support redundant dual-module backup to ensure uninterrupted signal collection for critical process control loops

Application Scenarios

• Thermal power plant boiler flue gas, feed water pressure, steam flow DCS signal acquisition cabinet layout
• Petrochemical plant reactor temperature, pipeline pressure HART transmitter centralized data collection projects
• Water treatment plant dosing tank liquid level, inlet/outlet water flow analog monitoring supporting projects
• On-site faulty AI module replacement and daily maintenance of ABB System 800xA distributed control systems
• Old factory automation renovation to expand multi-channel HART analog signal measurement capacity
• ABB S800 I/O series analog input spare parts inventory backup for energy and process manufacturing enterprises
• Metallurgy, pharmaceutical continuous production process closed-loop control signal collection hardware maintenance projects