ABB AO2000 LS25

Description

Product Overview

The ABB AO2000 LS25 is a precision, analog output module designed as part of the ABB Advant/AC 800M S800 I/O family, specifically for the S800 Remote I/O station architecture. This high-density module provides critical functionality for converting digital control signals from a controller into precise analog current or voltage outputs to command field devices. The ABB AO2000 LS25 enables direct control of final elements such as control valves, variable frequency drive (VFD) speed references, and analog signal isolators, making it a cornerstone for regulatory control loops. Engineered for high reliability and accuracy in demanding industrial environments, the ABB AO2000 LS25 features electrical isolation, diagnostic capabilities, and a compact form factor. Its integration into the S800 I/O system ensures seamless communication with ABB’s AC 800M or other master controllers via fieldbus protocols. When a process requires precise and reliable analog actuation, the ABB AO2000 LS25 serves as the vital link between the digital control system and the analog physical world.

Product Parameters and Specifications

• Manufacturer: ABB

• Product Line: Advant / System 800xA, S800 I/O

• Module Type: Analog Output Module

• I/O Type: 16-channel analog output.

• Output Signals: Configurable per channel to either 0-20 mA / 4-20 mA current output or 0-10 V voltage output.

• Resolution: High resolution (typically 15-bit or better) for precise output signal generation.

• Accuracy: High accuracy specification (e.g., ±0.1% of full scale) ensuring consistent and reliable control.

• Isolation: Channel-to-channel and channel-to-system bus isolation to prevent ground loops and protect the system from field-side faults.

• Load Capacity: Specified maximum load for current outputs (e.g., up to 750 Ω) and minimum load for voltage outputs.

• Diagnostics: Comprehensive diagnostics including wire break detection (for current outputs), short-circuit detection, and module health status, communicated back to the controller.

• Communication Connection: Interfaces via a built-in FI810F or similar fieldbus communication module (Profibus DP, Foundation Fieldbus H1, or MODBUS) or directly to an S800 I/O Station Controller (CI801, CI830, etc.).

• Power Supply: Requires 24V DC field power for the output circuits.

• Module Identifier: The “LS25” suffix typically indicates a specific hardware version or revision within the AO2000 series.

Advantages and Key Features

1. High Channel Density and Compact Design: The ABB AO2000 LS25 provides 16 analog outputs in a single module slot, optimizing space in the S800 I/O rack and reducing the cost per channel for systems requiring many control outputs.

2. Superior Accuracy and Stability: With high resolution and excellent long-term stability, this module ensures that control valve positions or drive speeds accurately follow the controller’s commanded setpoint, which is critical for product quality and process efficiency.

3. Advanced Diagnostic Capabilities: Its integrated diagnostics allow for predictive maintenance by detecting issues like open circuit (wire break) on a 4-20mA loop or output channel faults, enabling repairs before they cause a process deviation or shutdown.

4. Flexible Output Configuration: Each of the 16 channels can be independently configured as current or voltage output via software, providing great flexibility to interface with a wide variety of field devices without changing hardware.

5. Seamless System Integration: As a native part of the ABB S800 I/O system, the ABB AO2000 LS25 is easily configured and parameterized within ABB’s Control Builder M engineering suite, with automatic documentation and consistent data handling across the 800xA system.

Application Case Studies

• Continuous Chemical Reactor Control: In a polymer plant, multiple ABB AO2000 LS25 modules are used to output 4-20mA signals to control the opening of catalytic feed valves, reactor coolant valves, and product discharge valves, maintaining precise temperature and pressure for consistent polymer grade.

• Power Plant Burner Management: For a gas-fired boiler, the module provides analog speed references to multiple forced draft (FD) and induced draft (ID) fan VFDs, allowing for precise air-fuel ratio control. Its diagnostics help prevent a fan from running at an uncontrolled speed due to a signal fault.

• Water Treatment pH Control: In a neutralization basin, the analog outputs from an AO2000 LS25 module control the stroke of acid and caustic dosing pumps. The high accuracy ensures precise chemical addition to maintain the pH within a narrow band, minimizing chemical waste and ensuring effluent compliance.

Comparison with Competing Products

Selection Suggestions and Important Notes

• Selection Suggestion:

  • Choose the ABB AO2000 LS25 when designing or expanding an S800 Remote I/O system for process control applications that demand a large number of high-precision analog control outputs.

  • It is the ideal selection when the project already utilizes or is committed to the ABB AC 800M controller and System 800xA engineering environment, ensuring full compatibility and support.

  • Prioritize this module for loops where output signal accuracy and reliability are critical to product quality, safety, or equipment protection.

• Important Notes:

  • Communication Module Requirement: The ABB AO2000 LS25 itself is not a bus interface. It must be paired with a compatible S800 fieldbus communication module (like an FI810F for Profibus DP) in the same I/O station to communicate with the master controller.

  • Power Supply Sizing: Ensure the 24V DC field power supply for the I/O station is adequately sized to handle the combined load of all active output channels from this and other modules, especially when driving low-impedance loads.

  • Configuration and Calibration: While highly accurate, critical loops may still require traditional field calibration of the entire loop (controller output to valve position). The module’s internal calibration is typically done via software.

  • Environmental Considerations: Adhere to the specified operating temperature and humidity ranges. In extremely harsh environments, consider the placement of the I/O station cabinet.

  • Firmware Compatibility: Ensure the module’s firmware is compatible with the version of the communication module and the master controller’s configuration software to avoid communication issues.

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