The ABB DSAO120A 3BSE018293R1 is a high-precision, dual-channel analog output module part of the versatile S800 I/O family from ABB. This module acts as a critical interface within ABB's Distributed Control Systems (DCS), such as System 800xA, converting digital commands from the controller into precise analog signals to control field devices like control valves and variable frequency drives.
In a precise chemical reactor temperature control loop, the controller calculates the required opening of a steam control valve. The ABB DSAO120A module receives this digital command. It then generates a highly accurate 4-20mA analog signal that positions the valve actuator. The reliability and accuracy of the DSAO120A ensure that the exact amount of steam is admitted, maintaining the reactor temperature within a critical range. This directly impacts product quality, safety, and efficiency, preventing costly deviations or unsafe conditions.
Main Parameters | Value/Description |
Product Model | ABB DSAO120A |
Order Code | 3BSE018293R1 |
Manufacturer | ABB |
Product Category | Analog Output Module |
I/O System | S800 I/O |
Parent System | ABB System 800xA, Advant® OCS with S800 I/O |
Number of Channels | 2 channels |
Output Signal | 0-20 mA, 4-20 mA, 0-10 V, etc. (software configurable per channel) |
Resolution | High resolution (e.g., 16-bit) for exceptional output accuracy |
Electrical Isolation | Channel-to-channel and channel-to-bus isolation |
Load Capacity | Suitable for driving standard actuator loads (e.g., up to 500 Ω for 20mA) |
Hot Swap Capable | Yes, supports online module replacement |
Mounting | Plugs into an S800 I/O station base unit |
The ABB DSAO120A is engineered for accuracy and reliability in critical control loops, with its value stemming from several key engineering features:
· •Innovation Point 1: High Precision and Independent Channel Control: Each of the two channels features independent Digital-to-Analog Converters (DACs) and signal conditioning. This high-resolution conversion ensures the output signal is a precise representation of the controller's command, which is crucial for applications like control valve positioning where small signal errors can lead to significant process deviations. Channels operate completely independently.
· •Innovation Point 2: Advanced Signal Integrity and Isolation: A key feature is comprehensive electrical isolation. Each output channel is isolated from the others and from the internal system bus. This prevents ground loops, suppresses electrical noise from the field, and protects the entire I/O system from potential voltage transients, guaranteeing signal integrity in electrically noisy industrial environments.
· •Innovation Point 3: Flexible Configuration and Diagnostics: The module can be easily configured via the system engineering tool (Control Builder). Operators can set each channel as current or voltage output, define failure states, and scale values. Furthermore, the module provides detailed diagnostic information, such as wire-break detection on current outputs, enabling predictive maintenance and rapid troubleshooting.
A thermal power plant needed to improve the control accuracy of its combustion air dampers to optimize boiler efficiency. The existing analog output cards were prone to drift. The plant upgraded its S800 I/O system with ABB DSAO120A modules. The superior accuracy and stability of the DSAO120A provided a much more precise control signal to the damper actuators. This resulted in tighter control of the air-to-fuel ratio, leading to a measurable improvement in combustion efficiency and a significant reduction in emissions, demonstrating a direct return on investment through fuel savings.
The ABB DSAO120A operates within an integrated S800 I/O framework. Essential related products include:
· •ABB TU810V1 3BSE013230R1: A base unit that provides the physical slot and electrical connection for the DSAO120A module.
· •ABB CI854A 3BSE030220R1: A PROFIBUS DP communication interface that connects the entire S800 I/O station (including the DSAO120A) to the higher-level DCS controller.
· •ABB DSQC320A 3BSE018294R1: A digital output module often used in the same station for controlling on/off devices, complementing the analog control outputs of the DSAO120A.
· •ABB AI810 3BSE008516R1: An analog input module for reading process variables, providing the feedback signals needed for the control loops that the DSAO120A closes.
· •ABB PP845 3BSE042935R1: A power supply module for the S800 I/O station, providing clean and reliable power to all modules.
Installation of the ABB DSAO120A is designed for efficiency. The module is simply plugged into its designated slot in the S800 I/O base unit. Field wiring is connected to the terminal block on the base unit, not the module itself, allowing for easy module replacement without disturbing the field wiring.Maintenance is streamlined by the module's advanced diagnostics, which are accessible through the System 800xA operator interface. Potential issues like channel faults or communication errors are reported immediately, allowing for planned maintenance. If a module needs replacement, it can be hot-swapped (in supported configurations) without stopping the process. We provide full technical support, from configuration assistance to troubleshooting, ensuring the optimal performance and longevity of your DSAO120A modules and the overall control system.
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