ABB 3BHE027632R0101
ABB 3BHE027632R0101
ABB 3BHE027632R0101
ABB 3BHE027632R0101

ABB 3BHE027632R0101 | AC 800M Controller CPU Module

  • Brand:​ ABB
  • ••
    Model:​ PM851A (Order Code: 3BHE027632R0101)
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    Product Type:​ Process Controller (CPU Module)
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    Series:​ AC 800M
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    Core Function:​ Serves as the compact, cost-effective central processing unit for ABB’s System 800xA and other automation systems, executing control logic and managing I/O communications.
  • ••
    Key Specs:​ Single-core processor, 400 MHz, 32MB RAM, integrated interfaces.
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Part number: ABB 3BHE027632R0101
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Description

PM851A: Product Overview
The PM851A (order code 3BHE027632R0101) is a compact controller module within ABB’s AC 800M series, designed for basic to medium-complexity automation applications. This module functions as the central processing unit in control systems, executing regulatory control algorithms, sequence logic, and handling communication with I/O modules and operator interfaces. Installed in an AC 800M baseplate, the PM851A is engineered for applications where a full-scale high-performance controller is not required, providing a cost-effective solution while maintaining the reliability and engineering environment of the AC 800M platform.
The controller operates as the central component in a control architecture, interfacing with ABB’s S800 I/O system via various fieldbus protocols. It runs control application programs developed with ABB’s Control Builder engineering software, processing real-time data from field devices and executing control commands. The PM851A is designed for deterministic performance in continuous process operations and discrete automation applications, offering a balance of processing capability, I/O capacity, and economic value.

ABB 3BHE027632R0101

ABB 3BHE027632R0101

PM851A: Technical Specifications
  • ••
    Model Number:​ PM851A
  • ••
    Order Number:​ 3BHE027632R0101
  • ••
    Manufacturer:​ ABB
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    Product Type:​ Process Controller (CPU)
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    Processor:​ Single-core, 400 MHz
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    Memory:​ 32MB RAM for application program and data
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    Battery Backup:​ For memory retention during power loss
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    Communication Ports:
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      1x Ethernet port (for engineering and operator communication)
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      1x serial port (for legacy device integration)
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      Integrated fieldbus interfaces (e.g., for S800 I/O communication)
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    I/O Capacity:​ Supports up to 400 I/O points (application dependent)
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    Power Supply:​ 24V DC via power supply module
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    Operating Temperature:​ 0°C to 60°C
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    Relative Humidity:​ 5% to 95% non-condensing

    ABB 3BHE027632R0101

    ABB 3BHE027632R0101

Core Features & Customer Value
The PM851A’s primary value proposition is delivering the reliability and engineering environment of the AC 800M platform at an entry-level price point. For system integrators and end-users, this means access to ABB’s robust control system architecture with lower initial investment. The controller supports the same engineering tools (Control Builder) and I/O systems as higher-end AC 800M controllers, protecting software investments and simplifying future upgrades.
The integrated communication interfaces reduce hardware requirements and system complexity. The Ethernet port provides connectivity for engineering stations and operator interfaces, while the serial port enables integration with legacy devices such as modems, barcode readers, or other serial equipment. This integrated approach simplifies cabinet design and reduces component count.
Typical Applications
In water and wastewater treatment plants, the PM851A controls pumping stations, chemical dosing systems, and filtration processes. The controller’s reliability and adequate I/O capacity make it suitable for these continuous processes where 24/7 operation is required but extreme processing power is not necessary.
In HVAC systems for large commercial buildings, the controller manages temperature control, ventilation sequences, and energy optimization strategies. The compact size and cost-effectiveness make it appropriate for these applications where control complexity is moderate but reliability is important.

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