ABB S800 I/O Redundant Analog Output Module | AO845A 3BSE045584R1

Product Overview

The ABB AO845A (3BSE045584R1) serves as a high-integrity Analog Output (AO) module within the S800 I/O system. This module provides 8 channels of 4..20 mA current signals to drive control valves, actuators, and analog positioners. We supply this unit as 100% Brand New and Original, featuring advanced loop supervision and support for both single and redundant configurations. It acts as a critical execution component for AC 800M controllers, ensuring precise and reliable process modulation in demanding industrial environments.

Technical Specifications

The AO845A utilizes 12-bit resolution to deliver accurate analog control signals across 8 independent channels:

Engineering Advantages

• Native Hardware Redundancy: The AO845A supports redundant pairing. If one module fails, the secondary module takes over the output signal seamlessly. This eliminates single points of failure in critical control loops, such as steam turbine valves or chemical feed pumps.

• Integrated Loop Supervision: Each channel includes a supervised Digital Input (DI) function. The module constantly monitors the integrity of the external wiring and the actuator load. It detects open circuits or shorted loops instantly, reporting faults to the DCS before the process deviates from the setpoint.

• High Load Driving Capability: With a maximum load resistance of 750 ohms, this module drives signals over long distances through high-impedance field devices. This capability allows for flexible cabinet placement in large-scale plants without requiring external signal boosters.

• Compact DIN-Rail Integration: The slim 45 mm width maximizes the number of analog outputs per linear decimeter of rail space. This high-density design reduces the required number of S800 I/O stations and minimizes the overall control cabinet footprint.

• Flexible Termination Options: This module interfaces with a wide variety of Module Termination Units (MTUs), including the TU810, TU812, TU830, and redundant TU842/TU852. This compatibility allows engineers to select the specific terminal type (screw, spring, or fused) that best fits the site wiring standards.

FAQs

• Does the AO845A require a specific MTU for redundancy?

  Yes. To utilize the redundancy feature, you must install the modules in pairs on a redundant Module Termination Unit, such as the TU842 or TU843. For single applications, standard MTUs like the TU810 are sufficient.

• What is the benefit of the "A" suffix in AO845A?

  The "A" version represents an enhanced hardware revision that improves thermal management and signal stability compared to the original AO845, while maintaining full backward compatibility.

• Is this a refurbished or used unit?

  Absolutely not. We guarantee this AO845A (3BSE045584R1) is 100% Brand New original hardware. It arrives in the original ABB factory packaging with all security seals and technical documentation intact.

• Can this module drive a 0..20 mA signal?

  While optimized for the industrial standard 4..20 mA range, the hardware supports 0..20 mA configurations via software settings in the Control Builder M environment.