ABB AC800M PM864
ABB AC800M PM864
ABB AC800M PM864
ABB AC800M PM864
ABB AC800M PM864

ABB PM864 | Central Processing Module for Advant Controller

  • Brand: ABB
  • Model: PM864
  • Product Type: Main Processor Unit (MPU)
  • Series: S800 I/O, INFI 90 / Advant Open Control
  • Core Function: Executes control strategies; manages system communication and I/O data exchange.
  • Key Specs: Dual-redundant configuration option; 32 MB application memory.
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Part number: ABB PM864
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Description

PM864: Product Overview
The PM864 is a central processing module designed for deployment within ABB’s S800 I/O system, a key component of the legacy INFI 90 and Advant Open Control distributed control architectures. Its primary role is to serve as the computational heart of a control node, responsible for executing the user-developed control logic and managing all data traffic between the associated I/O modules and the broader plant-wide network. The module is engineered to meet the rigorous demands of continuous process control in sectors such as power generation, oil and gas, and chemical manufacturing.
Functionally, the processor handles the scheduling of tasks, execution of control algorithms (such as PID loops), and management of communication protocols. It interfaces with S800 I/O modules to read analog and digital signals, and it communicates with operator stations, engineering workstations, and other control nodes via high-speed serial links or Ethernet. The module belongs to the S800 I/O family, which offers a distributed and modular approach to building control systems. The benefit of this platform is its proven reliability and scalability, allowing end-users to configure systems tailored to specific application sizes and complexities without compromising performance. The ability to implement dual-redundant processors ensures high availability, a critical requirement in most industrial processes.

ABB AC800M PM864

ABB AC800M PM864

PM864: Technical Specifications
  • Model Number: PM864
  • Manufacturer: ABB
  • Product Type: Main Processor Unit
  • Power Supply: 24 VDC nominal (range 19.2-31.2 VDC)
  • Number of Processors: 2 (for redundant operation)
  • Application Memory: 32 MB Flash
  • Communication Ports: Two RS-232C, one Ethernet (RJ45)
  • Supported Protocols: S9001, MODBUS TCP, TCP/IP
  • Operating Temperature: 0°C to +60°C
  • Storage Temperature: -40°C to +70°C
  • Dimensions (HxWxD): 240 x 115 x 45 mm (approx.)
  • Weight: 0.8 kg (approx.)
  • Humidity: 5% to 95% non-condensing
  • Processor Clock Speed: 133 MHz
Core Features & Customer Value
Redundant Processing Architecture: The module incorporates two independent processors that run in lockstep. For the customer, this provides a fault-tolerant system where a failure in one processor does not interrupt control operations, thereby enhancing plant safety and minimizing the risk of costly unplanned shutdowns.
Flexible Communication Capabilities: With integrated RS-232C and Ethernet ports supporting protocols like S9001 and MODBUS TCP, the processor can seamlessly integrate into existing plant networks. This allows engineers to consolidate data from diverse sources and simplifies the connectivity to modern host systems or SCADA platforms.
Extended Memory Capacity: The 32 MB of flash memory provides sufficient space for storing complex control programs and historical data logging. This enables the implementation of advanced process control strategies and diagnostics without concerns of memory limitations.
Ruggedized Industrial Design: Engineered to operate within a standard 0°C to +60°C range and withstand high humidity, the module is suitable for installation in non-climate-controlled control rooms or enclosures. This design reduces the need for additional environmental conditioning, lowering overall system costs.

ABB AC800M PM864

ABB AC800M PM864

Typical Applications
The PM864 is implemented in process control environments that rely on the ABB INFI 90 or Advant Open Control system architecture. A common application is in large-scale fossil fuel power plants, where it is used to control boiler feedwater systems, combustion air regulation, and turbine governor functions. In this context, its redundant design ensures continuous operation of critical loops.
In petrochemical refineries, the module is often found in distributed control nodes managing sections of a catalytic cracker or crude distillation unit. It processes signals from temperature, pressure, and flow transmitters to maintain optimal reaction conditions and product quality. Another significant application area is in municipal or industrial water treatment facilities, where it controls chemical dosing, filtration rates, and pump sequencing across multiple remote stations. Its robust communication abilities allow it to serve as a gateway between field devices and central monitoring systems.

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