Product Description

Overview

The PM861AK01 from ABB is a high-performance processor unit designed for the AC 800M automation controller series, part of the System 800xA family. This complete kit combines the PM861A CPU, TP830 baseplate, and necessary accessories to deliver robust, modular control for demanding industrial applications. It is particularly suited for scenarios requiring redundancy, high availability, and seamless communication across multiple I/O systems.

The processor excels at executing complex control strategies, including continuous analog control, sequence management, and logic operations, while supporting large-scale data acquisition. Its modular form factor simplifies maintenance and allows flexible system expansion.

Key Features

High Availability and Redundancy

• Supports redundant CPU configurations, allowing one PM861A to serve as a backup for continuous operation without process interruption.

• Designed for fault-tolerant control in critical infrastructure environments.

Connectivity and Communication

• Dual Ethernet ports for Control Network communication (MMS protocol) with redundant network support.

• Two serial interfaces: RS232C with modem signals (COM3) and isolated COM4 for configuration tools.

• Expandable with CI8xx modules for PROFIBUS DP, PROFINET, Foundation Fieldbus, and Modbus TCP.

Advanced Processing and Memory

• 32-bit RISC CPU running at 48 MHz.

• 16 MB RAM for handling thousands of I/O points and complex control loops.

• 8 MB flash memory for firmware storage and application backup.

• IEC 61131-3 programming support via Control Builder M.

Industrial-Grade Design

• Compact, modular “book-style” form factor compatible with DIN rail mounting.

• Hot-swappable modules reduce downtime during maintenance.

• IP20 protection class, suitable for panel-free installations.

• Full EMC certification for industrial reliability.

Technical Specifications

Applications

• Oil & Gas: Unit control and process management.

• Chemical & Pulp/Paper: Complex analog and discrete control loops.

• Power Generation: Small-to-medium turbine and balance-of-plant control.

• Hybrid Systems: Integration of fast logic control with analog regulatory functions.

Model Comparison / Notes

For higher performance or memory demands, ABB recommends PM866 or PM867, which provide faster processing and larger memory. Always verify firmware compatibility in Control Builder M or 800xA when deploying PM861A units.

FAQ

Q: Can the PM861AK01 operate in a redundant configuration?
A: Yes, two PM861A CPUs can be paired for seamless primary/backup operation.

Q: How many I/O modules can it support locally?
A: Up to 12 S800 I/O modules on the local ModuleBus.

Q: What programming environment is compatible?
A: Control Builder M with IEC 61131-3 standard languages.