ABB PM856AK01 3BSE066490R1 Processor Unit AC 800M series ABB 800xA

The PM856AK01 is a high-performance processor unit from ABB's AC 800M series, designed for use in the ABB 800xA distributed control system (DCS) and other industrial automation applications .

Key Features & Benefits

Feature Description

High Performance Powered by a 24 MHz MPC860 processor, capable of executing 1000 boolean operations in 0.46 ms .

Memory Capacity Comes with 16 MB total memory (10.337 MB RAM available for applications) and 2 MB Flash PROM for firmware storage .

Communication Interfaces The base plate (TP830) features two RJ45 Ethernet ports (Control Network) and two RJ45 serial ports (COM3: RS-232C, COM4: isolated for configuration tool) .

Modular & Expandable Supports step-by-step expansion with I/O modules and communication modules on the CEX bus (up to 12 modules) and Modulebus (up to 96 I/O modules) .

Robust & Reliable IP20 protection class, operates from +5°C to +55°C, and includes a built-in 3.6V lithium battery for memory backup .

Easy Installation Features a unique slide & lock mechanism for simple DIN rail attachment/detachment .

Technical Specifications

Specification Detail

Ordering Details

Product ID 3BSE066490R1 

Type Designation PM856AK01 

Processor

Clock Frequency 24 MHz 

Processor Type MPC860 

Memory

Total Memory 16 MB 

RAM for Application 10.337 MB 

Flash for Storage Yes 

Flash PROM (Firmware) 2 MB 

Performance

Boolean Operations (1000) 0.46 ms 

Cycle Time (min) Down to 1 ms 

Power

Supply Voltage 24 V DC (19.2 - 30 V DC) 

Typical Current Draw 180 mA 

Max Current Draw 300 mA 

Power Dissipation (Typical) 4.32 W 

Backup Battery Lithium, 3.6 V 

Physical

Dimensions (W x H x D) 119 mm x 186 mm x 135 mm (4.7" x 7.3" x 5.3") 

Weight (incl. base) 1100 g (2.4 lbs) 

Protection Class IP20 

Environmental

Operating Temperature +5 °C to +55 °C (+41 °F to +131 °F) 

Storage Temperature -40 °C to +70 °C (-40 °F to +158 °F) 

Certifications CE, cULus Class 1 Zone 2, ABS, BV, DNV-GL, LR 

Package Contents

The PM856AK01 processor unit kit typically includes :

PM856A CPU

TP830 Baseplate

TB850 CEX-bus terminator

TB807 ModuleBus terminator

Battery for memory backup (3BSE066490R1)

Note: Licenses for the control software are usually sold separately.

Related Product Model List

The table below lists related ABB AC 800M processor units and common compatible I/O modules.

AC 800M Processor Units

Model Number Product ID Description / Key Difference

PM856AK01 3BSE066490R1 Standard processor unit, 24 MHz, 16 MB memory 

PM851AK01 3BSE066461R1 Basic controller, lower performance

PM861AK01 3BSE068230R1 High-integrity controller

PM864AK01 3BSE068232R1 High-integrity controller with redundancy

PM866AK01 3BSE076939R1 High-integrity controller with extended features

PM891 3BSE076940R1 High-integrity controller for SIL 3 applications

Compatible I/O Modules (Partial List)

Model Number Product ID Description

AI810 3BSE008516R1 8-ch, Analog Input, 4-20 mA 

AO810V2 3BSE038415R1 8-ch, Analog Output, 4-20 mA 

DI810 3BSE008508R1 16-ch, Digital Input, 24 V dc

DO810 3BSE008510R1 16-ch, Digital Output, 24 V dc, 0.5 A

AI815 3BSE052604R1 8-ch, Analog Input, 4-20 mA, HART 

AO815 3BSE052605R1 8-ch, Analog Output, 4-20 mA, HART 

Communication & Accessories

Model Number Product ID Description

CI801 3BSE022256R1 PROFIBUS DP Communication Interface

CI853 3BSE043660R1 Serial Communication Module (RS-232/485)

TB850 3BSE008444R1 CEX-Bus Terminator

TB807 3BSE008539R1 ModuleBus Terminator