ABB AI845 3BSE023675R1 Redundant 8-Channel Analog Input Module

Description

The AI845 is a versatile input module for current-based transmitters, offering accurate signal conversion and integrated HART communication for seamless device diagnostics. Designed for high availability, it supports single or redundant setups via dedicated MTUs, ensuring continuous visibility of key process variables during maintenance or faults.

Specifications

• Manufacturer: ABB

• Country of Origin: Sweden

• Model Number: AI845 (3BSE023675R1)

• Input Channels: 8 channels (single-ended)

• Signal Range: 4 to 20 mA, 0 to 20 mA

• A/D Resolution: 12 bits

• HART Support: Bi-directional HART communication pass-through

• Redundancy: Supports 1:1 redundancy

• Power Supply: 24 VDC nominal

• Physical Weight: 0.25 kg (0.55 lbs)

Features

• High-Availability Redundancy: Specifically designed to work in pairs, providing a bumpless transfer of signal processing if the primary module fails.

• HART Protocol Integration: Facilitates digital communication with smart field devices for remote calibration and asset management.

• Built-in Current Limiting: Protects the module and system electronics against field wiring short circuits and over-current conditions.

• Advanced Internal Diagnostics: Continuously monitors the health of A/D converters and internal power rails, reporting status via LED indicators.

• Under-range and Over-range Detection: Automatically identifies and flags signal levels outside the standard 4-20 mA window to catch sensor failures.

• Galvanic Isolation: Features robust isolation between the field inputs and the internal ModuleBus to prevent electrical surge damage.