Overview
The ABB PM856AK01 3BSE018128R1, also cataloged as the PM856AK01 Processor Unit, operates as a dedicated hardware component for controller execution, application processing, and Ethernet communication within the ABB AC 800M control system.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PM856AK01 3BSE018128R1 |
| Brand | ABB |
| Product Type | AC 800M Processor Unit |
| Processor Type | MPC860 |
| Clock Frequency | 24 MHz |
| Performance | 0.46 ms per 1000 boolean operations |
| Memory | 16 MB |
| RAM Available for Application | 10.337 MB |
| Flash Memory for Storage | Yes |
| Firmware Flash PROM | 2 MB |
| Redundancy Support | No |
| High Integrity Support | No |
| Number of Applications per Controller | 32 |
| Programs per Application | 64 |
| Diagrams per Application | 128 |
| Tasks per Controller | 32 |
| Application Cycle Time | Down to 1 ms |
| Weight | 1100 g |
| Dimensions | 119 mm W x 186 mm H x 135 mm D |
| Operating Temp | 0 to +55 deg C |
| Storage Temperature | -40 to +70 deg C |
| Power Supply | 24 VDC (19.2 to 30 VDC) |
| Power Consumption | 180 mA typical, 300 mA maximum at +24 VDC |
| Power Dissipation | 4.32 W typical, 7.2 W maximum |
| Ethernet Interface | 2 channels, IEEE 802.3, 10 Mbit/s, RJ-45 |
| Control Network Protocol | MMS and IAC |
| RS-232C Interfaces | 2 ports |
| CEX Bus Modules | Up to 12 single CEX bus modules |
| CEX Bus Supply Current | Maximum 2.4 A |
| Modulebus I/O Capacity | Maximum 96 I/O modules |
| Modulebus Scan Rate | 0 to 100 ms |
| Backup Battery | Lithium 3.6 V |
| Clock Synchronization | 1 ms between AC 800M controllers by CNCP protocol |
| Protection Class | IP20 according to EN 60529 |
| Isolation Voltage | 500 VAC rated |
| Certifications | CE, EN 61000-6-4, EN 61000-6-2, UL 61010-1, UL 61010-2-201 |
Industrial Control Network and Firmware Compatibility
The PM856AK01 processor unit executes AC 800M controller applications through the MPC860 processor architecture and internal flash firmware storage. Furthermore, the module supports firmware retention through a 2 MB Flash PROM and provides application memory allocation for control programs, diagrams, and task scheduling.
The controller communicates through Ethernet interfaces using IEEE 802.3 physical connections and supports MMS and IAC control network protocols. Therefore, it integrates with AC 800M system architectures requiring deterministic controller communication and distributed I/O management.
The module supports industrial control functions through Modulebus and CEX bus expansion. Additionally, it manages up to 96 I/O modules on the Modulebus and supports connection of up to 12 CEX bus communication modules.
Frequently Asked Questions
Q: Does the PM856AK01 support redundant controller configurations?
A: No. The PM856AK01 is specified as a non-redundant processor unit and does not provide redundant CPU operation.
Q: What communication interfaces are available on the PM856AK01?
A: The processor unit provides two Ethernet channels with IEEE 802.3 10 Mbit/s interfaces and two RS-232C service communication interfaces.
Q: What is the maximum I/O capacity supported by the PM856AK01?
A: The controller supports a maximum of 96 I/O modules through the Modulebus interface.
Field Installation Guidelines
Install the PM856AK01 on the designated AC 800M controller mounting base and verify mechanical locking before applying power.
Connect the 24 VDC supply with correct polarity and maintain separation between power wiring, communication cables, and high-voltage conductors to reduce electrical interference.
Use shielded communication cables according to the system installation requirements. Ground cable shields at the recommended cabinet grounding point and avoid multiple grounding paths.
Before controller startup, verify Ethernet addressing, Modulebus configuration, CEX bus connections, and installed firmware compatibility with the AC 800M engineering environment.
Maintain ventilation clearance around the controller assembly and operate the unit within the specified industrial environmental limits.
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