ABB PM851AK01 3BSE066485R1 central processing unit CPU module

PM851AK01 is a central processing unit (CPU) module belonging to the AC 800M controller family within ABB's System 800xA distributed control system (DCS). It is designed as a cost-effective and reliable controller for medium to large-scale industrial automation and process control applications .

Key Features & Technical Specifications:

Processor & Memory: Equipped with a 48 MHz CPU, 8 MB of RAM, 2 MB of Flash PROM for firmware, and 12 MB of application memory (from 800xA 5.1 FP4) .

Communication Ports: The base plate (TP830) features:

2x RJ45 Ethernet ports (CN1, CN2) for connection to the Control Network. Note: The controller is restricted to one Ethernet (CN1) port; redundant Ethernet is not available .

2x RJ45 serial ports (COM3, COM4). COM4 is isolated and is used for connecting a configuration tool .

Modular Design: Supports step-by-step system expansion with I/O modules, communication interfaces, and other AC 800M series components .

Durability & Protection: IP20 protection class, allowing for DIN-rail mounting without an additional enclosure. It has full EMC certification for reliable operation in industrial environments .

Configuration: Can be configured using ABB's 800xA Control Builder engineering tool .

Non-Redundant: This is a standard, non-redundant controller, making it suitable for applications where high-availability redundancy is not required .

Typical Applications:

It is widely used in various industries for logic control, data processing, and communication management, including manufacturing lines, chemical plants, power systems, and water treatment facilities .

ABB PM851AK01 Product and Related Model List

The following table includes the main order code for the PM851AK01 and a list of related or comparable ABB controller modules for reference.

Model Number Product Type / Description Key Differentiator / Notes

PM851AK01 Basic Controller (AC 800M) The primary model. A basic, non-redundant controller. The order typically includes the CPU, TP830 base plate, and terminators .

3BSE066485R1 Ordering Code This is the specific sales/manufacturing product code for the PM851AK01 .

PM856AK01 Controller (AC 800M) A higher-performance controller within the same AC 800M family, offering more processing power and memory .

PM861AK01 Controller (AC 800M) A standard controller with more onboard memory and a higher performance level than the PM851AK01 .

PM864AK01 Controller (AC 800M) A high-end controller for large and complex applications, offering even greater performance .

PM866AK01 Controller (AC 800M) A high-integrity controller for applications requiring redundancy and enhanced reliability .

CI801 Profibus Communication Module A common communication interface module that can be used with the PM851AK01 to connect to Profibus DP networks .

DI810 / AI810 I/O Modules Examples of standard digital and analog I/O modules that can be connected to the controller via the Modulebus .