Description
ABB RAO02 Product Description
Product Overview
ABB RAO02 is a Redundant Analog Output Module for the ABB Ability™ Symphony® Plus SD Series I/O platform. It provides up to 16 independently configurable high-level analog outputs, with each channel selectable for 4–20 mA or 1–5 VDC operation. ABB identifies the current article number as 2VAA008428R1.
The RAO02 is designed for applications where analog control signals must remain available with a redundant I/O architecture, making it suitable for process control, turbine control, power generation and other continuous-operation industrial applications.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | RAO02 |
| Article Number | 2VAA008428R1 |
| Product Type | Redundant Analog Output Module |
| System | Symphony Plus SD Series I/O |
| Number of Channels | 16 |
| Signal Type | Analog Output |
| Output Range | 4–20 mA / 1–5 VDC |
| HART | Yes |
| Redundancy | Yes |
| D/A Resolution | 12 bits |
| Accuracy | ±0.1% FSR |
| Module Power | 100 mA typical @ 24 VDC ±10% |
| Output Load | 0–750 Ω, current mode |
| Voltage-Mode Load | Minimum 22 kΩ |
| Channel Isolation | Group isolated |
| Field-to-Logic Isolation | 1500 V |
| Operating Temperature | -40 to +70 °C |
| Dimensions | 27 × 106 × 190 mm |
| Weight | Approx. 240 g |
| Mounting | Horizontal row / vertical column |
| Status Indication | Run, Fault and channel LEDs |
ABB’s current hardware selector confirms the RAO02 as a 16-channel redundant analog output module, with 4–20 mA or 1–5 VDC outputs and HART support.
Main Features and Advantages
16 Independent Analog Outputs
The RAO02 provides 16 individually configurable analog output channels. Each channel can be programmed for either current or voltage output according to the requirements of the connected field device.
Redundant I/O Architecture
As a redundant analog output module, RAO02 is intended for applications where continued availability of control outputs is important. This makes it particularly appropriate for critical process and turbine-control applications.
RAO02
4–20 mA and 1–5 VDC
Each output can independently support:
- 4–20 mA
- 1–5 VDC
This provides compatibility with a broad range of industrial actuators, positioners, controllers and other analog field equipment.
HART v5.4 Support
In current-output mode, the RAO02 supports HART v5.4 instruments and can provide access to secondary HART variables. ABB specifies support for up to 24 secondary variables in total, with up to four secondary variables per channel.
High Accuracy and Resolution
The module uses a dedicated 12-bit D/A converter for each output channel and provides accuracy of approximately ±0.1% of full-scale range. This supports stable analog control in process applications.
Electrical Isolation
The outputs are group isolated, with ABB specifying 1500 V isolation between the field signal and logic and between the channel groups. This helps reduce the impact of electrical disturbances and ground-potential differences in industrial installations.
Short-Circuit and Open-Circuit Protection
In current mode, the RAO02 provides output protection by limiting current and can detect an open circuit in less than five seconds.
System Integration
The RAO02 is part of ABB’s Symphony Plus SD Series I/O architecture. ABB specifies compatibility with HBR01-EPD and VBR01-EPD mounting bases.
The controller uses:
- Function Code 221 — I/O Device Definition
- Function Code 223 — Analog Output Channel configuration
These functions configure the module and individual analog-output channels, including engineering units, alarm limits and default output behavior following loss of controller communication.
Application Fields
Power Generation
RAO02 is well suited to power plants and turbine-control systems, where redundant analog control signals are required for valves, actuators, governors and other equipment.
Process Automation
The module can generate analog control signals for flow, pressure, temperature and level control loops in continuous-process applications.
Oil & Gas and Petrochemical
The combination of 16 analog channels, HART support and redundancy makes RAO02 suitable for critical process-control installations in refineries and petrochemical facilities.
Chemical Industry
The isolated analog outputs can interface with control valves, positioners and other field instruments in chemical processing systems.
Water and Utilities
RAO02 can support analog control of pumps, valves, drives and other equipment in water-treatment and utility applications.
Related ABB Products
- ABB RAI02 — Redundant Analog Input module with 16 high-level analog input channels.
- ABB RDI01 — Redundant Digital Input module for 24/48 VDC signals.
- ABB RDI02 — Redundant Digital Input module for 125 VDC / 120 VAC signals.
- ABB RDO01 — Redundant Digital Output module in the SD Series.
- ABB HBR01-EPD — Mounting base compatible with RAO02 and other redundant SD Series I/O modules.
