AI845 3BSE023675R1 | ABB S800 I/O 8-Channel HART Analog Input Module

Product Overview

The ABB AI845 (3BSE023675R1) acts as a high-density analog input gateway for the S800 I/O system, providing 8 independent channels for current and voltage signals. This module integrates full HART pass-through capabilities, allowing the controller to access advanced diagnostics and configuration data from smart field instruments. It supports redundant configurations, making it a critical component for high-availability process applications where signal loss results in costly downtime. We supply this unit as 100% brand new original hardware in factory-sealed packaging.

Technical Specifications

The AI845 delivers high-precision signal conversion with built-in transmitter power and groupwise isolation.

• Article Number: 3BSE023675R1

• Channels: 8 Single-ended unipolar

• Signal Ranges: 0..20 mA, 4..20 mA, 0..5 V, 1..5 V

• HART Support: Yes (Pass-through)

• Redundancy: Supported (Module redundancy)

• Resolution: 12 bit

• Accuracy: Max. 0.1% error

• Update Cycle: 10 ms

• Input Impedance: 250 Ω (Current) / 10 MΩ (Voltage)

• Temperature Drift: Max. 50 ppm/°C

• Filter Rise Time: 290 ms (0-90%)

• Max Cable Length: 600 meters (656 yards)

• Diagnostics: Front LEDs for Fault, Run, and Warning; internal supply and checksum monitoring.

Engineering Advantages

• Redundant System Security: The AI845 supports paired module redundancy. If one module fails, the backup unit takes over signal processing instantly, maintaining continuous operation of critical process loops without manual intervention.

• Integrated Smart Diagnostics: By supporting the HART protocol, this module retrieves secondary variables and device status directly from smart transmitters. Engineers diagnose field device health from the control room, reducing the need for site visits in hazardous or remote areas.

• Built-in Transmitter Power: The module includes current-limited transmitter power for each channel. This simplifies cabinet wiring by eliminating the need for external fuse terminals and individual power distribution blocks for 2-wire instruments.

• Extensive Field Protection: Groupwise isolation from ground and high-voltage dielectric testing (500 V a.c.) shield the internal Modulebus from field-side surges. The module also features non-destructive protection up to 11 V d.c. against accidental wiring errors.

• High Update Rate: A 10 ms update cycle time ensures the control system receives rapid feedback from the process, supporting fast control loops in pressure and flow management.

FAQs

• Does the AI845 require an external power supply for 4-20 mA transmitters? The AI845 provides built-in current-limited power for transmitters. However, you must connect a 24 V d.c. external source to the module to power the field-side circuits and transmitters.

• Can I mix voltage and current signals on the same module? While the module supports both 0..20mA/4..20mA and 0..5V/1..5V ranges, you typically configure the signal type through the hardware settings. Ensure the input impedance matches your field device (250 Ω for current or 10 MΩ for voltage).

• Is this module a direct replacement for older S800 units? The AI845 fits standard S800 mounting and mechanics. However, always verify that your current controller firmware and CI8xx communication interface software support the AI845's specific 12-bit HART features.

• What is the condition of this ABB part? We guarantee this unit is 100% Brand New original ABB stock. It arrives with factory seals intact and includes full technical traceability.