Overview
The ABB 3BSE076359R1, also cataloged as the PM866A Processor Unit, operates as a dedicated hardware component for executing control logic, data processing, and communication tasks within the ABB AC 800M Controller and System 800xA platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PM866A Processor Unit |
| Brand | ABB |
| Origin | Sweden |
| Product ID | 3BSE076359R1 / 3BSE076939R1 |
| Controller Family | AC 800M Controller / System 800xA |
| Processor Type | CPU Processor Unit |
| Processor Speed | 133 MHz |
| Memory (RAM) | 64 MB |
| Flash Memory | 1 MB |
| Power Supply | 24 VDC nominal, 19.2 – 30 VDC range |
| Power Consumption | Not specified in provided data |
| Ethernet Interfaces | 2 x RJ45 Control Network ports (CN1, CN2) |
| Serial Interfaces | 2 x RJ45 serial ports (COM3, COM4) |
| Peripheral Interface | CompactFlash interface and USB port |
| Rated Isolation Voltage | 500 VAC |
| Emitted Noise | Less than 55 dB (A) |
| Vibration Resistance | 10 < f < 50 Hz: 0.0375 mm amplitude; 50 < f < 150 Hz: 0.5 g acceleration |
| Dimensions | Approx. 186 mm x 119 mm x 135 mm |
| Weight | Approx. 1.2 kg |
| Mounting Method | Installed on compatible AC 800M baseplate such as TP830 |
Industrial Control Network Communication and Firmware Compatibility
The ABB PM866A integrates into the AC 800M controller architecture through dedicated Control Network Ethernet interfaces. Moreover, the dual RJ45 CN1 and CN2 ports support network connection requirements for controller communication and redundant configurations.
The processor unit uses internal firmware and flash memory resources to manage application execution, controller configuration storage, and system diagnostics. In addition, the CompactFlash interface provides a local method for application transfer and backup operations without requiring an active engineering station connection.
The PM866A follows ABB industrial controller design principles for backplane bus communication velocity management, I/O density scaling, and firmware flash compatibility across supported AC 800M hardware configurations.
Frequently Asked Questions
Q: Does the PM866A support redundant controller configurations?
A: Yes. The PM866A supports redundant AC 800M controller configurations when installed with compatible hardware components and system configuration settings.
Q: Which communication interfaces are available on the PM866A processor unit?
A: The PM866A provides two RJ45 Ethernet ports for Control Network communication, two RJ45 serial ports, one CompactFlash interface, and one USB interface.
Q: Can the PM866A operate without a CompactFlash card?
A: The provided specifications do not define mandatory CompactFlash operation. The interface is available for application loading and backup functions.
Field Installation Guidelines
Install the PM866A on the specified AC 800M baseplate before connecting power, network, and peripheral interfaces. Verify that the mounting position provides sufficient mechanical support and maintains proper airflow around the processor unit.
Connect the Control Network cables to the designated CN1 and CN2 Ethernet ports. Keep communication wiring separated from high-voltage power cables to reduce electrical interference. Furthermore, apply standard industrial grounding practices for cabinet installation and ensure cable shields connect according to the system grounding design.
Before commissioning, check the processor status indicators, verify the power supply connection, and confirm firmware compatibility with the installed AC 800M controller configuration.
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