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ABB PM861AK01 3BSE018157R1
The ABB PM861AK01 (3BSE018157R1) is an AC 800M processor unit kit designed for ABB System 800xA and AC 800M automation control platforms. It serves as the central processing module responsible for executing application logic, managing communication networks, and coordinating distributed I/O systems in industrial process automation applications.
The PM861AK01 belongs to ABB’s classic AC 800M controller family and is widely used in industries requiring reliable continuous control, including power generation, oil & gas, chemical processing, water treatment, and manufacturing automation systems.
Product Parameters
| Parameter |
Specification |
| Manufacturer |
ABB |
| Model |
PM861AK01 |
| Article Number |
3BSE018157R1 |
| Product Type |
Processor Unit Kit / Central Unit |
| System Platform |
ABB AC 800M / System 800xA |
| Processor Type |
MPC860 |
| Clock Frequency |
48 MHz |
| Memory |
16 MB |
| Application RAM Available |
7.155 MB |
| Flash Memory |
Supported |
| CPU Redundancy |
Supported |
| Power Supply |
24 VDC (19.2–30 VDC) |
| Typical Power Dissipation |
6.0 W |
| Protection Class |
IP20 |
| Mounting Type |
DIN rail mounting |
| Operating Temperature |
0 to +55 °C |
| Weight |
Approx. 1.2 kg |
Core Function
The ABB PM861AK01 operates as the main processing unit of an AC 800M controller system. Its primary functions include:
- Running control applications created with ABB Control Builder
- Executing PLC logic, sequencing, and process control algorithms
- Managing communication between controller modules and field devices
- Handling S800 I/O communication through ModuleBus
- Supporting redundant controller configurations for increased system availability
- Providing real-time processing for industrial automation tasks
The controller supports CPU redundancy, including redundancy of CPU, CEX-Bus, communication interfaces, and S800 I/O connections.
Design Features
High Reliability Control Architecture
The PM861AK01 is designed for continuous industrial operation with fault monitoring, LED diagnostics, and backup memory support to improve system availability.
Redundant Control Capability
The module supports redundant configurations with fast controller switchover, helping minimize downtime in critical automation systems.
Integrated Communication Interfaces
The controller baseplate provides:
- 2 × RJ45 Ethernet ports for control network communication
- 2 × serial interfaces (RS-232C)
- CEX-Bus expansion capability for communication modules
Modular Expansion
The AC 800M architecture allows flexible expansion with communication modules, S800 I/O modules, and other automation components.
Hardware Composition
The PM861AK01 kit typically includes:
- PM861A CPU module
- TP830 baseplate
- TB850 CEX-Bus terminator
- TB807 ModuleBus terminator
- TB852 RCU-Link terminator
- Memory backup battery
- 4-position power plug
The modular hardware design allows easy installation, replacement, and expansion within ABB AC 800M control cabinets.
Application Scenarios
The ABB PM861AK01 processor unit is commonly applied in:
- Power plant control systems
- Turbine and generator automation
- Oil and gas production facilities
- Chemical and petrochemical process control
- Water and wastewater treatment plants
- Manufacturing production lines
- Distributed control systems (DCS)
- Industrial equipment automation
It is especially suitable for applications requiring high availability, stable communication, and long-term continuous operation.
Maintenance Considerations
- Verify 24 VDC power supply stability before replacement or commissioning.
- Check controller firmware compatibility with the existing AC 800M configuration.
- Replace the backup battery according to maintenance schedules to protect stored data.
- Confirm CEX-Bus, ModuleBus, and communication module compatibility during upgrades.
- Before replacing a redundant controller, verify synchronization and redundancy settings.
For system upgrades, engineers should confirm the lifecycle status and migration requirements of existing AC 800M installations.
Overall Evaluation
The ABB PM861AK01 3BSE018157R1 is a reliable AC 800M processor unit designed for industrial automation and DCS applications. With integrated Ethernet communication, expandable architecture, memory backup, and redundancy support, it provides a stable control solution for demanding process industries. It remains a commonly referenced spare part for maintaining existing ABB System 800xA installations.
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