Description
The ABB PM864AK01 (3BSE018161R1) is a central processing unit designed for the AC 800M control system. The unit executes control logic, manages I/O communications, and provides network connectivity for industrial processes. It operates on a 24 V DC power supply and features 32 MB of non-volatile flash memory alongside 32 MB of RAM. This controller supports both single and redundant configurations to prevent system downtime in critical applications.
Technical Specifications
| Parameter | Value / Specification |
| Model Number | PM864AK01 |
| Product ID | 3BSE018161R1 |
| System Compatibility | ABB System 800xA, AC 800M Controller Series |
| Processor Type | 32-bit RISC Motorola MPC860T running at 96 MHz |
| Onboard RAM | 32 MB |
| Flash Memory | 32 MB (Non-volatile) |
| Power Input | 24 V DC (19.2 to 30 V DC acceptable range) |
| Power Consumption | 6 W (Typical) |
| Communication Interfaces | 2 x RJ45 Ethernet ports (10/100 Base-T), 2 x RS-232C serial ports |
| Redundancy Support | Yes (Requires identical peer module and BC810/BC820 interconnect) |
| Clock Resolution | 1 ms |
| Operating Temperature | +5 to +55°C (+41 to +131°F) |
| Storage Temperature | −40 to +70°C (−40 to +158°F) |
| Relative Humidity | 5 to 95% (Non-condensing) |
| Protection Class | IP20 according to IEC 60529 |
| Programming Standards | IEC 61131-3 (ST, IL, LD, FBD, SFC) |
Commercial and Logistics Terms
- Condition: New Original (Factory Sealed)
- Warranty: 12-Month Comprehensive Warranty
- Availability: In Stock
- Lead Time: Ships within 1 to 2 business days from order confirmation
- Pricing: Price subject to market conditions; contact us for a firm quote
Engineering Overview & Integration Notes
In field deployments of AC 800M systems, the PM864AK01 functions as the core executing unit for complex regulatory and discrete control loops. It communicates natively with S800 I/O modules via ModuleBus or through extended communication interfaces like Profibus DP, Modbus RTU, and EtherNet/IP via dedicated CI-modules.
Firmware and Software Compatibility
The PM864AK01 requires specific system software versions depending on your Control Builder M or System 800xA engineering environment. Mixing different firmware revisions in a redundant pair will cause a synchronization failure. Always flash the backup controller to match the primary unit’s firmware before forcing a switchover.
Redundancy Architecture
When configured for hardware redundancy, two PM864AK01 units connect via a RCU (Redundant Control Unit) link using BC810 or BC820 baseplates. The primary unit continuously replicates its dynamic memory state to the backup unit. If the primary hardware fails, the backup assumes control within 10 ms to 25 ms, maintaining execution states without bumping outputs.
Field Note: Ensure that the backup battery unit (SB821 or SB822) is fully charged and tested during routine maintenance intervals. A depleted battery will result in a loss of application code during an unpowered cold restart.
Frequently Asked Questions
What is the difference between the PM864A and the PM864AK01?
The PM864AK01 is a complete kit that typically includes the PM864A CPU module, the TP830 baseplate, and basic termination components. Verify the exact contents of the kit with the OEM datasheet or your representative before finalizing installation layouts.
Can I upgrade an existing PM861 or PM864 to a PM864AK01 without modifying the application code?
The application code compiled under IEC 61131-3 standards is highly portable within the AC 800M family. However, you must update the hardware configuration settings in Control Builder M to reflect the new processor model, verify memory allocations, and perform a full compilation before download.
How do I handle a “Battery Low” fault indication on this module?
The red battery LED indicates that the backup power source for the volatile RAM is below the safe threshold. Replace the external battery module while the controller is powered on to avoid data loss. If the controller loses 24 V DC power while this indicator is active, the application
