AI845 3BSE023675R1 ABB High-density HART analog input module AC 800M System 800xA

Product Overview

ABB AI845 is a new generation 16-channel analog input module in the AC 800M distributed control system, specifically designed for smart factories and digital transformation projects. Based on the high-density advantage of AI815, this module further optimizes the HART communication performance and diagnostic capabilities, supporting full-channel synchronous HART polling. It can efficiently collect the main variable (PV), equipment status, diagnostic information and multivariable data from intelligent transmitters such as pressure, temperature and flow.

Core features

16-channel high-density design
Supports 4-20mA current signal (active/passive compatible)
Input impedance: < 250 Ω (Ensure no impact on circuit power supply)
A single module saves 50% cabinet space compared to traditional 8-channel modules
Full-channel HART 7 compatibility
Each channel independently supports the HART 5/6/7 protocol
Support multi-variable transmission (such as PV, SV, TV, QV)
Configurable HART polling cycle (up to 2 seconds per device)
Seamless integration with System 800xA Asset Optimizer
Spring terminal tool-free wiring
Push-in technology, supporting 0.14-2.5mm ² (26-12 AWG) wires
Anti-vibration and anti-loosening, suitable for harsh industrial environments
The wiring efficiency has been increased by 50%, and maintenance is more convenient

Technical parameters

Large-scale deployment of intelligent transmitters: Hundreds of HART instruments are centrally connected in oil refineries and chemical plants
Predictive maintenance system: Predicts equipment failures through HART diagnostic data (such as diaphragm stress, electronic board temperature)
Energy and public utility monitoring: Unified collection of steam flow, cooling water temperature, and compressed air pressure
Pharmaceutical and food industry: Rapid maintenance under high cleanliness requirements (Spring terminals do not require tools)
Old DCS upgrade project: Achieving a leap from "signal acquisition" to "equipment health management" with high cost performance

Installation and Usage instructions
Hardware installation
Insert AI845 into the S800 I/O electronic frame (TB842A redundant base plate is recommended);
Connect to the CI854A (optical fiber) or CI801 (electrical) communication module via the ModuleBus cable;
Use shielded twisted-pair cables to connect to the 4-20mA circuit on site, with the shielding layer grounded at a single point.
Software configuration
Add the AI845 device in Control Builder M v6.0+;
Automatic recognition of 16 channels and HART capability;
Configure for each channel:
Engineering units (bar, °C, m³/h, etc.)
Upper and lower limits of the range
HART variable mapping (PV → DCS tag)
Alarm threshold and filtering time
Enable Asset Optimizer for device health analysis.
Debugging and verification
Green LED: The module is operating normally
Red LED flashing: Channel-level fault (such as disconnection or HART no response)
View real-time values, device labels, and HART status words through the System 800xA screen

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