Description

ABB PM866A Central Processing Unit

The ABB PM866A 3BSE076359R1, also cataloged as the PM866A Processor Unit, operates as a dedicated hardware component for CPU execution, memory management, and communication control within the ABB AC 800M controller platform.

Hardware Specifications

Parameter	Specification
Model	ABB PM866A
Brand	ABB
Origin	Sweden
Product Type	Processor Unit / CPU Module
Series	ABB AC 800M
Catalog Number	3BSE076359R1
Processor Clock Frequency	133 MHz
RAM Memory	64 MB
Flash Memory	1 MB / 2 MB depending on configuration
Communication Interfaces	2 x Ethernet RJ45 ports, 2 x RS-485 serial ports (COM3 / COM4)
Redundancy Support	CPU redundancy supported
Protection Class	IP20
Operating Temp	-40 deg C to +70 deg C
Dimensions	119 mm width x 186 mm height x 135 mm depth
Weight	Approx. 1.1 kg - 1.2 kg
Power Consumption	CPU module power consumption depends on AC 800M controller configuration

ABB AC 800M Backplane Communication and Firmware Compatibility

The ABB PM866A integrates into the AC 800M controller architecture through high-speed backplane communication functions. It manages application execution, controller diagnostics, and I/O data exchange between connected system modules. Furthermore, the processor supports Ethernet-based communication networks and serial interfaces for distributed automation configurations.

The CPU supports firmware-based functionality management and configuration compatibility within the ABB AC 800M engineering environment. Therefore, system engineers can apply controller-level updates while maintaining communication parameters and application execution settings.

The module also supports CPU redundancy configurations. In redundant controller systems, the PM866A can participate in synchronized processor operations to maintain controller availability during CPU-related faults.

Frequently Asked Questions

Q: Does the ABB PM866A support CPU redundancy configurations?
A: Yes. The PM866A supports CPU redundancy functions within compatible ABB AC 800M controller configurations. The redundancy function requires matching controller hardware and system configuration settings.

Q: Which communication interfaces are available on the PM866A?
A: The PM866A provides 2 Ethernet RJ45 ports and 2 RS-485 serial ports identified as COM3 and COM4 for controller communication tasks.

Q: Can the PM866A operate in extended temperature environments?
A: Yes. The specified operating temperature range is -40 deg C to +70 deg C, allowing installation in industrial control environments with wide temperature variation.

Field Installation Guidelines

• Install the PM866A on the designated ABB AC 800M controller mounting arrangement with correct mechanical alignment.
• Verify backplane connection integrity before applying system power.
• Maintain proper grounding practices for the controller cabinet and communication cable shields.
• Route Ethernet and RS-485 communication cables separately from high-voltage power conductors to reduce electrical interference.
• Confirm firmware compatibility between the PM866A processor unit and the connected AC 800M controller system before commissioning.
• Check redundancy configuration parameters when installing dual CPU controller arrangements.

Specifications

• Brand: ABB

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems