Product Overview

The ABB PM875-2 (Part Number: 3BDH000606R1) is a high-performance CPU Processor Unit designed for ABB 800xA Distributed Control System (DCS) and AC 800M controller platforms. As the central processing unit of the controller, it executes control programs, manages communication with I/O modules, processes field data, and coordinates system operations in real time.

Engineered for mission-critical industrial applications, the PM875-2 provides high processing performance, advanced communication capabilities, and support for redundant controller configurations, making it suitable for continuous process automation.

Technical Specifications

Function and Working Principle

The PM875-2 CPU Processor Unit serves as the primary processing engine of the ABB automation system. It continuously executes application programs, processes data received from I/O modules, and transmits control commands to field equipment.

The processor communicates with supervisory systems and distributed I/O through high-speed industrial communication networks, ensuring deterministic and reliable process control.

Operating Sequence

1. Field devices send signals through I/O modules.
2. The PM875-2 receives process data from the system backplane.
3. The CPU executes control logic and automation programs.
4. Output commands are transmitted to actuators and field equipment.
5. Process status is continuously monitored and updated in the control system.

Key Features

• High-performance industrial CPU
• Real-time process control
• Supports redundant controller configurations
• High-speed Ethernet communication
• Large memory capacity for complex applications
• Reliable industrial-grade design
• Seamless integration with ABB 800xA systems
• Designed for continuous 24/7 operation

System Role

The PM875-2 functions as the central processing controller of the automation system, coordinating communication, control logic, and data management.

Typical System Architecture

Field Devices → I/O Modules → PM875-2 CPU Processor Unit → ABB 800xA System → HMI / Engineering Station

Industrial Applications

The PM875-2 is widely used in:

• Distributed Control Systems (DCS)
• Power generation plants
• Oil and gas production
• Petrochemical facilities
• Chemical processing plants
• Water and wastewater treatment
• Pulp and paper industry
• Mining and mineral processing
• Industrial manufacturing automation

Installation Guidelines

• Install the processor unit in a compatible AC 800M controller rack.
• Ensure adequate cabinet ventilation for heat dissipation.
• Verify the controller power supply before installation.
• Connect Ethernet and communication cables securely.
• Follow ESD protection procedures during installation.
• Perform controller configuration and diagnostics before commissioning.

Compatible Components

The PM875-2 is compatible with:

• ABB AC 800M Controller Base Units
• ABB S800 I/O Modules
• ABB Communication Interface Modules
• ABB Redundant Power Supply Modules
• ABB 800xA Distributed Control System
• ABB Engineering and Operator Stations

Alternative Models

Advantages

• High-speed real-time processing
• Reliable industrial performance
• Supports redundant system architecture
• Excellent communication capability
• High system scalability
• Easy maintenance and module replacement
• Designed for critical industrial applications

Frequently Asked Questions

What is the ABB PM875-2 used for?

The PM875-2 serves as the main CPU Processor Unit for ABB AC 800M controllers, executing automation programs and managing industrial process control.

Does the PM875-2 support redundancy?

Yes. It supports redundant controller configurations to improve system availability and operational reliability.

Which automation platform is it designed for?

It is designed for the ABB AC 800M controller platform within the ABB 800xA Distributed Control System.

What communication interfaces are available?

The processor supports high-speed Ethernet, serial communication, and internal controller backplane communication.

Which industries commonly use the PM875-2?

It is widely deployed in power generation, oil and gas, petrochemical, chemical processing, water treatment, mining, and large-scale industrial automation systems.

Conclusion

The ABB PM875-2 (3BDH000606R1) CPU Processor Unit is a high-performance industrial controller designed for the ABB AC 800M platform. Featuring powerful real-time processing, advanced communication capabilities, and support for redundant system architectures, it provides a dependable solution for complex process automation and mission-critical industrial control applications.