AO820 3BSE008546R1 ABB Analog Output 4 ch S800 I/O 0…20 mA Module

Product Specification

AO820 3BSE008546R1 ABB Analog Output 4 ch S800 I/O 0…20 mA Module

1.Overview of the AO820 3BSE008546R1 ABB

The AO820 (order number 3BSE008546R1) is a 4-channel analog output module in the ABB S800 I/O family, designed for control systems such as the AC800M, AC800C, AC800PEC, and Compact Product Suite. It accurately converts digital signals from the controller into 0…20 mA or 4…20 mA currents, enabling it to drive control valves, variable speed drives, actuators, or any device requiring high-precision current commands. It is an ideal choice for process automation, plant energy management, and machinery OEMs.

This series is a comprehensive, distributed, and modular process I/O system that communicates with a variety of process controllers from ABB and other vendors via industry-standard fieldbuses such as PROFIBUS DP. It is commonly used in ABB's AC800M controller family and 800xA DCS (distributed control systems).

2.Core Features:

Core Specifications

Channels: 4, single-ended, common ground
Output Range: 0…20 mA / 4…20 mA (software-configurable, per channel)
Resolution: 15 bits + sign (< 0.01% of range)
Accuracy: ±0.1% of range @ 25°C; ±0.2% of range -40…70°C
Temperature Drift: < 50 ppm/°C
Load Capacity: 0…750 Ω (@ 20 mA)
Response Time: < 5 ms (10…90% step)
Open Wire Detection: Real-time hardware monitoring, dual alarms via LED and system variables
Short-Circuit Protection: Infinite duration, short-circuit current < 25 mA, automatic recovery
Isolation: 500 V AC channel-to-bus, non-isolated between channels
Power Consumption: Typical 1.2 W, Maximum 2 W (4 channels, 20 mA fully loaded)
Module Dimensions: W45 × H Dimensions: 119 x 75 mm deep, weight: 300 g

Installation and Wiring

Base: TU830/TU833 (Extended MTU) or TU810/TU812 (Compact MTU)
Terminals: Screw or spring-loaded, supports wire diameters from 0.2 to 2.5 mm²
Cable: Shielded, twisted pair, single-point grounding, meets EMC Class A
Hot-Swap: Supports online replacement without interrupting other modules

Feature Highlights

Redundancy Support: Can be plugged into a PM865/PM866 redundant controller, automatically synchronizing output values
Online Calibration: Remotely access ABB calibration routines via CI867/CI868 without disconnecting cables
Advanced Diagnostics: Channel open, short circuit, overtemperature, and power drop generate SOE events, directly triggering Asset Optimization work orders
Output Hold: Configurable to "Hold Last Value," "Set to Preset Safety Value," or "Reset to Zero" when the CPU is down or communication is interrupted
HART Transmission: Compatible with CI840 HART commands can be superimposed on the 4…20 mA loop to remotely read and write valve positioner parameters.
Environmentally friendly design: RoHS/REACH compliant, -40…70°C wide operating temperature range, and 4000 m altitude without derating.

Typical Applications

Process valve: Drives linear or rotary positioners with a 4…20 mA input for PID control of flow, pressure, and temperature.
Inverter speed command: Directly connects to the ACS880/ACS580, 0…20 mA corresponds to 0…50 Hz, without an additional isolation barrier.
Power plant bypass: Outputs valve position commands in steam turbine DEH systems, with redundant configuration meeting SIL2 requirements.
Pharmaceutical dosing: In conjunction with 800xA Batch, outputs dosing control signals with an accuracy of < 0.05%, meeting FDA 21 CFR Part 11.
Water treatment dosing: Utilizes the AC 800M PID control block, AO820 Drives metering pumps for closed-loop regulation of residual chlorine.

Ordering and Accessories

Required: AO820 module 3BSE008546R1
Base: TU830 (extended MTU, supports redundancy) or TU810 (standard MTU)
Label: TB820/TB830 color-coded marking strips for easy channel identification
Cable: TK851 shielded cable for HART handheld communicator connection
Spare parts: 10% redundancy is recommended for easy online replacement

Summary

The ABB AO820 3BSE008546R1, with its four channels of 0.01% accuracy, 5 ms response time, open/short circuit diagnostics, and redundancy support, is the preferred module for high-performance, high-reliability 4…20 mA control signal outputs in the S800 I/O system.

3.Product details pictures

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