May 27, 2026

B&R 3AO775.6 Analog Output Module

The 3AO775.6 is a compact, high-density analog output module designed for the B&R SYSTEM 2005 series. It provides 8 independent 0–20 mA current output channels with 11-bit resolution, delivering reliable and cost-effective analog control for industrial automation. Featuring galvanic isolation between the control side and field side, short-circuit protection, and IP20 protection, it ensures stable operation in environments with electromagnetic interference and vibration. The single-slot design saves cabinet space and simplifies system integration, making it a practical choice for standard current-loop control applications.

Description

B&R 3AO775.6 Analog Output Module

Product Introduction

Basic Information

Model: 3AO775.6
Brand: B&R (Bernecker + Rainer, ABB Group)
Series: SYSTEM 2005
Product Type: Analog Output Module (AO)
Output Channels: 8 channels, 0–20 mA current signal
Resolution: 11-bit
Power Supply: 5 VDC from backplane (max 1 W); 24 VDC for field circuits (max 4.5 W)
Total Power Consumption: Max 5.5 W
Protection Class: IP20 (EN 60529)
Operating Temperature: 0 °C to +60 °C
Storage Temperature: -25 °C to +70 °C
Relative Humidity: 5%–95%, non-condensing
Isolation: Galvanic isolation between control and field sides; no channel-to-channel isolation
Certifications: CE, C-UL-US, GOST-R
Installation: Standard single slot for SYSTEM 2005 racks, DIN rail mountable (EN 50022)
Compatible Terminal Block: 3TB170.9 (screw clamp) / 3TB170.91 (cage clamp), sold separately

Function and Positioning

The 3AO775.6 acts as the interface between B&R SYSTEM 2005 controllers and current-driven field devices. It converts digital control signals from the PLC into standard 0–20 mA analog current outputs, suitable for driving proportional valves, frequency converters, regulators, and other current-loop actuators. With 8-channel high-density design, it meets multi-loop control needs, while 11-bit resolution and basic accuracy of ±0.5% ensure reliable precision for general industrial applications. Positioned as an economical, space-saving analog output solution, it is ideal for small-to-medium automation systems requiring stable current signal output.

Core Performance Parameters

Channel Configuration: 8 analog output channels, 0–20 mA range
Resolution: 11-bit
Conversion Time: 250 µs for all channels
Basic Accuracy: ±0.5% full scale at 20 °C
Precision: ±0.75% full scale (0 °C to 60 °C)
Load Capacity: Max 500 Ω per channel
Output Protection: Short-circuit proof
Filter: 1st-order low-pass filter, 1 kHz cut-off frequency
Status Indicators: Onboard RUN LED for converter status
Diagnosis: Channel-level fault detection and reporting
EMC Compliance: EN 61000-6-2, EN 61000-6-4
Configuration: Parameterization via B&R Automation Studio

General Compatible Accessories

B&R SYSTEM 2005 series backplanes and multi-slot expansion racks
SYSTEM 2005 series CPU modules and X2X bus-compatible I/O modules
24 VDC industrial power supplies (e.g., 0PS105.1, 0PS205.1)
Shielded twisted-pair cables for 0–20 mA current signal transmission
3TB170.9 (screw clamp) / 3TB170.91 (cage clamp) terminal blocks
B&R Automation Studio for programming, configuration, and maintenance
0–20 mA-compatible actuators (proportional valves, frequency converters, current-driven regulators)

Applicable Equipment Fields

Factory Automation: Packaging machinery, machine tools, assembly lines, general production equipment
Process Industry: Chemical, pharmaceutical, food and beverage, water treatment, papermaking, textile
Energy Sector: Power plant auxiliary control, renewable energy systems, energy efficiency equipment
Motion Control: Frequency converter regulation, proportional valve control, basic positioning systems
Building Automation: HVAC systems, environmental monitoring, building management systems
Industrial Sites: Environments with moderate electromagnetic interference, vibration, and wide temperature ranges
B&R SYSTEM 2005-based automation projects requiring 8-channel 0–20 mA analog output

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