ABB PM862 Central Processing Unit (CPU Module)

1. Overview

The ABB PM862 is a central processing unit (CPU) developed for the ABB AC 800M control system, a core component of the 800xA automation platform. It serves as the brain of the system—executing control strategies, managing communication, and coordinating data exchange between I/O modules and field devices. Known for its speed, reliability, and scalability, the PM862 is widely used in industrial process control, power automation, and manufacturing systems where uninterrupted operation and precision are essential.

2. Technical Specifications

3. Design and Construction

The PM862 CPU module is engineered with a compact and modular architecture. It includes a high-performance processor board, communication interfaces, and an integrated real-time clock module with a replaceable lithium battery. Diagnostic LEDs on the front panel indicate RUN, ERROR, and COM status for quick fault detection. The module is mounted on a baseplate, allowing connection to I/O units through the ModuleBus. Its design supports hot-swapping and easy integration within redundant configurations.

4. Features and Highlights

High-speed 32-bit processor for deterministic control performance

Dual Ethernet interfaces for redundant network configurations

Multi-protocol communication for flexible system integration

Battery-backed memory to preserve data during power outages

Hot-swap capability allowing module replacement without shutdown

Built-in diagnostic LEDs for quick system status monitoring

Seamless compatibility with ABB’s 800xA software environment

Compact, fanless, and low-power design for industrial reliability

5. Application Fields

The ABB PM862 is widely implemented in industries such as:

Power generation and electrical substations

Oil, gas, and petrochemical processing

Water and wastewater management

Pulp and paper manufacturing

Food and beverage automation

Metals, mining, and material handling systems

6. Installation and Maintenance

Mount securely onto the designated AC 800M baseplate.

Ensure the 24 V DC supply is stable and correctly polarized.

Connect communication cables (Ethernet, serial) as specified in ABB wiring diagrams.

Maintain adequate ventilation to prevent overheating.

Use ABB’s Control Builder M tool for setup, programming, and firmware updates.

Replace the backup battery periodically to retain time and memory data.

Keep the module free from dust and moisture; perform regular system diagnostics.

7. Advantages in Automation Systems

The PM862 delivers outstanding real-time performance, robust reliability, and long-term stability. Its modular and scalable design allows easy system expansion, while redundant configuration support ensures minimal downtime. As part of ABB’s 800xA platform, it provides a powerful and flexible foundation for process control and industrial automation, ensuring maximum productivity and operational efficiency.