AO845A 3BSE045584R1 ABB High-density intelligent analog output module AC 800M System 800A

Product Overview

ABB AO845A is a new generation 16-channel analog output module in the AC 800M distributed control system. While providing high-density 4-20mA output, it natively supports HART digital communication write function. It can directly send set values, range parameters or operation commands to on-site HART execution devices (such as intelligent valve positioners and frequency converters), achieving true "digital + analog" hybrid control.

Core features

16-channel high-density output
Output signal: 4-20 mA (default), which can be configured by software as 0-20 mA
Load capacity: Maximum 750 Ω (@24V DC)
Output accuracy: ±0.1% of span (typical value, 25°C)
HART writing function (industry-leading) :
Support writing commands (such as set points, damping time, and range) to HART devices connected to each channel
Compatible with HART 5/6/7 protocol, suitable for intelligent valve positioners (such as ABB TZIDC, YTC, etc.)
HART data goes directly to the field equipment without the need for an additional communication gateway
Spring terminal tool-free wiring
Push-in technology, supporting 0.14-2.5mm ² (26-12 AWG) wires
Anti-vibration and anti-loosening, significantly reducing installation and maintenance time

Technical parameters

Intelligent valve control: Send set point and stroke calibration instructions to HART valve positioners (such as ABB TZIDC)
Remote speed regulation of the frequency converter: The frequency setting value or start-stop command is written through 4-20mA + HART
Chemical process optimization: Dynamically adjust the opening degree of the feed valve of the reaction vessel and remotely modify the parameters of the positioner
Energy management system: Centrally control the rotational speeds of multiple cooling tower fans and upload the equipment status
Digital transformation project: On the basis of retaining the existing 4-20mA circuit, add digital control capabilities

Installation and Usage instructions
Hardware installation
Insert the AO845A into the S800 I/O electronic rack (TB842A redundant base plate is recommended);
Connect to the CI854A (optical fiber) or CI801 (electrical) communication module via ModuleBus;
Connect the output terminal to the on-site HART execution device using shielded twisted-pair cables.
Software configuration
Add the AO845A device in Control Builder M v6.0+;
Configure for each channel:
Output range (4-20 mA / 0-20 mA
Engineering units (%, Hz, °C, etc.)
HART device type and write variables (such as PV Setpoint)
Fail-safe mode (Hold/Reset/Previous value)
Enable Asset Optimizer for device health monitoring.
Debugging and verification
Green LED: The module is operating normally
Red LED flashing: Channel-level fault (such as short circuit or HART non-response)
The output value can be forced through Control Builder M or the HART command can be sent for testing.

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