1. Product Overview

The Standard Analog Output Module (AO) is designed for the ABB Symphony Plus control system and fully compatible with the Harmony Rack architecture.
Its core function is to convert digital control instructions from the system into continuous analog electrical signals, enabling precise adjustment and closed-loop control of on-site equipment and processes.

2. Key Technical Parameters

Parameter	Specification
System Compatibility	ABB Symphony Plus Control System
Mounting Type	Harmony Rack Standard Slot
Channel Configuration	16 independent analog output channels
Output Signal Types	4–20 mA DC, 0–10 V DC, 1–5 V DC (software configurable)
Signal Resolution	12-bit or 16-bit (selectable per system configuration)
Signal Accuracy	High precision with minimal output error and excellent long-term stability
Channel Isolation	Independent optoelectronic isolation for each channel to prevent crosstalk and EMI interference
Power Supply	Supplied via system backplane (no external power required)
Communication Interface	Harmony Rack dedicated bus for high-speed data exchange with controller
Operating Temperature Range	–20 °C to +70 °C
EMC/EMI Immunity	Industrial grade, typically compliant with Level 4 standards

3. Functional Features and Advantages

Hot-Swappable Design
Supports live module replacement without system shutdown, reducing downtime and improving system availability.

Real-Time Status Monitoring and Diagnostics
Built-in channel-level diagnostic functions detect abnormal conditions such as overloads or disconnections, with fault feedback provided to the system for rapid fault localization.

High Reliability and Industrial Durability
Constructed with industrial-grade components and robust mechanical design featuring anti-vibration and anti-aging characteristics, ensuring stable long-term operation in harsh environments.

Flexible Configuration and Adaptability
Fully compatible with Symphony Plus configuration software, enabling flexible software-based configuration of signal type and range per channel—no hardware jumpers required.

4. Typical Application Areas

Electric Power Industry
Used for precise control tasks such as boiler water level and turbine speed regulation in thermal power plants, or guide vane positioning in hydropower applications. Outputs analog signals to drive control valves and actuators.

Petrochemical and Chemical Industry
Provides accurate analog control signals for regulating temperature, pressure, and flow in reactors and pipelines, interfacing with control valves, VFDs, and actuators.

Metallurgy and Building Materials
Applied in steel mill pressure control, furnace temperature management, and rotary kiln regulation in cement production, supporting hydraulic or electric actuator control.

Municipal and Environmental Engineering
Used in water and wastewater treatment processes to regulate dissolved oxygen, control dosing pumps, and maintain stable operational parameters.