The CPU board integrates the module’s core processing and system management components, including the microprocessor, RAM memory, real-time clock, LED status indicators, INIT push button, and a CompactFlash interface for data storage and firmware handling.

The PM864A base plate provides multiple communication interfaces to support system integration and configuration:

Two RJ45 Ethernet ports (CN1, CN2) for connection to the Control Network, supporting redundant Ethernet communication.

Two RJ45 serial ports (COM3, COM4):

COM3: RS-232C interface with modem control signals.

COM4: Electrically isolated port dedicated for configuration tools.

The controller supports full CPU redundancy to achieve high system availability, including redundant communication interfaces, redundant CEX-Bus operation, and redundant S800 I/O connectivity.

Installation is simplified through a slide-and-lock DIN-rail mechanism, allowing fast mounting and removal. Each base plate includes a unique hardware Ethernet address (shown on the TP830 label), ensuring unmistakable CPU identification within the network.

Features and Benefits

High Reliability and Easy Fault Diagnosis
Diagnostic LEDs, hardware identity labels, and modular communication ports simplify troubleshooting and maintainability.

Modular and Expandable System Architecture
The AC 800M platform supports step-by-step expansion through additional CEX-Bus modules, S800 I/O, and communication interfaces.

IP20 Protection Class
Provides adequate protection for installation within standard control cabinets without requiring additional enclosures.

Fully Supported by 800xA Control Builder
The controller is configured using ABB’s 800xA engineering tools, ensuring consistency, flexibility, and powerful control design capabilities.

Full EMC Compliance
Meets electromagnetic compatibility standards for industrial environments.

Sectioned CEX-Bus Support
Using BC810 bus sections, the CEX-Bus can be segmented to optimize system architecture and enhance reliability in distributed installations.

Standards-Based Communication Interfaces
Built on widely adopted industrial communication standards, including Ethernet and PROFIBUS DP, ensuring broad compatibility and flexible integration.

Built-In Redundant Ethernet Ports
Dual Ethernet interfaces provide inherent network redundancy, improving communication reliability in critical applications.