ABB PM856K01 Processor Unit Kit

Description

ABB PM856K01 Processor Unit Kit

Product Overview

The ABB PM856K01 is a central processing unit (CPU) kit belonging to the AC 800M controller family within ABB’s System 800xA and Compact Control Builder automation platforms.

Designed for medium-scale industrial process control and discrete automation, the PM856 processor features a high-performance 32-bit RISC architecture, built-in Ethernet communications (MMS and MasterBus 300), and support for redundant power supplies.

The PM856K01 designation typically represents a complete processor kit, which includes the CPU module (PM856), baseplate (TP830), power supply coupling accessories, and terminal blocks needed for DIN-rail mounting.

Technical Specifications

Key Advantages

• High Performance & Scalability: Powered by a 32-bit RISC processor with 8 MB RAM, providing fast execution cycles for logic, loop control, and batch processing.
• Seamless Integration with ABB System 800xA: Fully integrated into ABB’s flagship DCS platform as well as standalone Compact Control Builder environments.
• Built-in Ethernet Connectivity: Native Ethernet interfaces allow direct integration with SCADA systems, HMI panels, and plant networks without requiring extra communication cards.
• Modular Fieldbus Expansion: Uses the standard CEX-bus interface to easily add communication modules for PROFIBUS, Modbus, HART, and Ethernet/IP.
• Durable & Power-Efficient Design: Low power dissipation minimizes panel heating, while battery backup ensures critical volatile memory retention during power outages.

Important Usage & Installation Precautions

• Memory Battery Replacement: The internal RAM relies on a lithium backup battery to retain runtime data during power interruptions. Inspect battery health periodically and replace it according to maintenance schedules.
• Correct Baseplate Docking: Ensure the PM856 unit is properly seated and locked onto its baseplate (TP830) before applying 24 V DC power to avoid damage to the CEX-bus pins.
• Power Quality & Grounding: Supply clean 24 V DC power and ensure proper chassis grounding to prevent ground loops or high-frequency interference on Ethernet and ModuleBus lines.
• Environmental Limits: Operating temperature range is +5 °C to +55 °C. For installations in dusty, humid, or corrosive environments, mount the controller inside an appropriately rated IP54 or NEMA enclosure with forced ventilation or air cooling.
• Firmware Version Matching: Ensure that the firmware loaded on the PM856 controller matches the target version configured in ABB Control Builder / System 800xA engineering tools to prevent software mismatch errors during program downloads.

Applications

• Process Automation & DCS Systems: Widely used in chemical processing, water treatment, power generation, and food & beverage processing plants.
• Boiler & Turbine Auxiliary Control: Precise loop control and sequence logic for industrial boilers, steam systems, and burner management systems (BMS).
• Material Handling & Manufacturing: Centralized PLC/DCS control for conveyor lines, packaging lines, and automated distribution centers.
• Infrastructure & Facility Control: Environmental monitoring, HVAC management, and utility control in large industrial facilities.

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