ABB AO845 3BSE023676R1 Redundant 8-Channel Analog Output Module

Description

The AO845 is a high-reliability current output module that delivers 4–20 mA signals to control valves, positioners, and actuators. It supports bi-directional HART communication for device diagnostics and, with a redundant MTU, ensures fault-tolerant operation. Widely used in oil and gas, petrochemical, and power industries, it provides safe and stable process control.

Specifications

• Manufacturer: ABB

• Country of Origin: Sweden

• Model Number: AO845 (3BSE023676R1)

• Output Channels: 8 channels

• Signal Range: 4 to 20 mA

• D/A Resolution: 12 bits

• HART Support: Bi-directional HART protocol pass-through

• Redundancy: Supports 1:1 redundancy for high availability

• Power Supply: 24 VDC nominal

• Physical Weight: 0.25 kg (0.55 lbs)

• Maximum Load: 750 ohms at 20 mA

Features

• High-Availability Redundancy: Designed for paired operation to provide seamless failover, ensuring the process remains controlled during a module swap or internal fault.

• HART Protocol Capability: Facilitates digital data exchange with smart instruments, allowing for remote asset management and secondary variable monitoring.

• Intelligent Fail-Safe Logic: Features user-configurable safety states to hold the last valid signal or move to a pre-defined safe value during communication loss.

• Comprehensive Self-Diagnostics: Continuously monitors the health of internal digital-to-analog converters and output loop integrity.

• Active Current Supervision: Automatically detects open circuits and field wiring faults, reporting errors immediately to the central controller.

• Hot-Swap Support: Allows for live replacement of a faulty module without requiring a system shutdown, significantly reducing maintenance downtime.