PM861AK01 ABB System 800xA Controller Processor
Manufacturer: ABB
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Part Number: PM861AK01
Condition：New with Original Package
Product Type: Central Processor Units
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Country of Origin: Sweden
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Product Overview
The ABB PM861AK01 (3BSE018157R1) functions as the high-performance heart of the AC 800M control system. This 100% brand new original processor unit executes complex IEC 61131-3 control programs and synchronizes data across large-scale I/O subsystems. Designed specifically for mission-critical applications, it supports full hardware redundancy to eliminate single points of failure in power generation, oil and gas, and chemical processing facilities.
Technical Specifications
The PM861AK01 utilizes a specialized MPC860 architecture to deliver ultra-fast Boolean execution and deterministic cycle times.
| Parameter | Technical Detail |
| Model Number | PM861AK01 (3BSE018157R1) |
| Processor Architecture | MPC860 at 48 MHz |
| Memory Capacity | 16 MB RAM / 2 MB Flash PROM |
| Logic Speed | 0.23 ms per 1000 Boolean operations |
| Redundancy Switchover | < 10 ms |
| Communication Ports | 2x Ethernet, 1x RS-232C, 1x Isolated RS-485 |
| Input Power | 24 VDC (19.2 – 30 VDC) |
| Current Consumption | 250 mA to 430 mA |
| Battery Type | Lithium 3.6V (9g Weight) |
| Operating Temp | 0 °C to +60 °C |
| Weight | 1.2 kg |
| Dimensions | 119 mm (W) x 186 mm (H) x 135 mm (D) |
Engineering Advantages
The PM861AK01 provides technical solutions for the most demanding industrial automation challenges:
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Minimizes Process Interruption: In redundant configurations, the processor executes a bumpless transfer in less than 10 milliseconds. This ensures that even during a primary hardware failure, the secondary unit maintains control of the process without tripping safety interlocks.
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Facilitates Complex Networking: Integrated dual Ethernet and serial ports allow the module to manage CEX-bus communication and peer-to-peer networking simultaneously. This connectivity supports up to 32 applications per controller, allowing for highly modular software design.
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Reliable Data Retention: The unit includes a high-capacity lithium battery backup and a CompactFlash interface. These features safeguard your control logic and cold-retain variables during extended power outages, preventing the need for time-consuming field re-downloads.
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Robust Diagnostic Feedback: A comprehensive array of front-facing LEDs provides real-time status for CPU health, battery levels, and communication activity. This immediate visual feedback significantly reduces troubleshooting time for on-site technicians.
FAQs
Is the PM861AK01 compatible with the latest System 800xA versions?
While the PM861AK01 belongs to the Classic lifecycle tier, it remains fully integrated within System 800xA. However, for new high-performance installations, engineers often evaluate the PM866 or PM867 series for increased memory overhead.
How often should I replace the lithium battery in this unit?
To ensure program retention during power cycles, we recommend replacing the 3.6V lithium battery every 2-3 years, or whenever the "Low Battery" diagnostic LED activates. Note that the module is UN3091 classified due to the lithium content.
Can I mix redundant and non-redundant I/O on the same PM861AK01?
Yes. The PM861AK01 coordinates communication across the CEX-bus and S800 I/O families, allowing engineers to selectively implement redundancy only on critical process loops while using standard I/O for non-vital monitoring.
What is the maximum number of programs this controller can run?
This processor unit supports up to 64 programs per application, with a maximum of 32 applications per controller. This scalability makes it suitable for both localized equipment control and plant-wide coordination.