Description
ABB PM866AK01 Processor Unit (Part No. 3BSE076939R1)
Continuing the industrial automation equipment catalog sequence, PM866AK01 (Catalog / Part Number: 3BSE076939R1) specifies a high-performance Processor Unit for the ABB AC 800M controller family, part of the System 800xA distributed control system (DCS).
Key Specifications & Overview
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Manufacturer: ABB
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Product Series: AC 800M / System 800xA
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Component Type: Central Processing Unit (CPU) Kit
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Processor Speed: 133 MHz
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Memory Size: 64 MB RAM (supports memory backup via battery)
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Redundancy Support: Yes, supports CPU redundancy configurations (swappable/paired setup for high availability)
Package Contents (Kit Composition)
The “K” in the model suffix (PM866AK01) indicates it is delivered as a complete starter/replacement kit containing the core hardware and necessary terminators:
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PM866A: CPU Module
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TP830: Baseplate
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TB850: CEX-Bus Terminator
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TB807: ModuleBus Terminator
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TB852: RCU-Link Terminator (for redundancy communication, if applicable)
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Battery: Memory backup battery
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Note: System software licenses are typically ordered separately.
Communication Interfaces
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Ethernet Ports: 2 built-in Ethernet ports (for Control Network / MMS communication and redundancy)
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COM Ports: 2 RS-232 serial ports (supporting protocols like Modbus or tool communication)
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ModuleBus / CEX-Bus expansion slots for localized I/O and communication modules (e.g., Profibus, PROFINET, or Advant Fieldbus 100).
Common Applications
The PM866AK01 is utilized in large-scale, mission-critical industrial process plants requiring robust control performance, high reliability, and tight integration with ABB’s System 800xA architecture, including:
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Oil & Gas Production and Refining
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Chemical and Petrochemical Processing
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Power Generation Facilities
PM866AK01
Product Overview
PM866AK01 (Order Code: 3BSE076939R1) is the CPU Module for ABB AC 800M Controller, part of System 800xA distributed control platform.
It serves as the main processing unit of AC800M control rack, executing continuous control loops, sequence logic, interlock algorithms and alarm handling. The module exchanges data with S800 I/O modules via CEX-bus, and communicates with engineering stations, operator stations and third-party devices through Ethernet and fieldbus interfaces. It is widely adopted in power, petrochemical, pulp & paper and water treatment process automation.
Technical Specifications
| Item | Parameter |
|---|---|
| Part Number | PM866AK01, 3BSE076939R1 |
| Module Type | AC 800M Main Processor Unit |
| Manufacturer | ABB |
| Applicable Platform | AC 800M Controller, System 800xA DCS |
| Processor | High-performance 32-bit real-time CPU |
| Memory | Program memory + battery-backed RAM for data retention |
| Internal Bus | CEX-bus for connecting S800 I/O modules |
| Communication Interfaces | Two RJ45 Ethernet ports; support redundant network configuration |
| Supported Protocols | Modbus TCP, OPC UA/DA, IEC 60870-5-104, Profibus (with matched communication modules) |
| Control Power | Supplied by rack baseplate |
| Hot Swap | Supported within certified AC800M rack |
| Operating Temperature | 0 ℃ ~ +60 ℃ |
| Ambient Humidity | 5%–95% non-condensing |
| Protection Class | IP20 (installed inside control cabinet) |
| Engineering Software | Control Builder M |
| Spare Part Status | Production discontinued; new surplus and refurbished modules available |
Key Features
- Dual Ethernet ports support network redundancy to avoid communication failure caused by single cable breakage
- Powerful real-time computing capability to handle complex continuous control and batch sequence logic
- Battery backup memory retains process variables and fault event logs when power is lost
- Built-in comprehensive self-diagnostic function, monitoring CPU operation, memory status and bus communication
- Mechanical coding lock prevents mismatched installation of different types of modules
- Matched with CI854, CI853, DI8xx, DO8xx, AI8xx, AO8xx series S800 I/O modules
- Different hardware revision variants cannot be directly interchanged without project reconfiguration and program download
