Overview
Configured for application program execution and controller communication in ABB AC 800M control systems, the ABB 3BSE066490R1 (PM856AK01 Processor Unit) provides direct physical and electrical execution for automation control tasks through the AC 800M controller platform.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PM856AK01 |
| Brand | ABB |
| Origin | Sweden |
| Weight | 1100 g (including base) |
| Dimensions | 119 mm W x 186 mm H x 135 mm D |
| Operating Temp | 0 to +55 deg C |
| Power Consumption | 4.32 W typical, 7.2 W maximum |
| Product Type | AC 800M Processor Unit |
| Article Number | 3BSE066490R1 |
| 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 |
| Flash PROM for Firmware Storage | 2 MB |
| Redundancy | No |
| High Integrity | No |
| Applications per Controller | 32 |
| Programs per Application | 64 |
| Diagrams per Application | 128 |
| Tasks per Controller | 32 |
| Cycle Times | Up to 32 different cycle times |
| Minimum Program Cycle Time | Down to 1 ms |
| Ethernet Channels | 2 |
| Ethernet Interface | IEEE 802.3 Ethernet, 10 Mbit/s, RJ-45 |
| Control Network Protocol | MMS and IAC |
| RS-232C Interfaces | 2 |
| Power Supply | 24 VDC (19.2-30 VDC) |
| Built-in Backup Battery | Lithium, 3.6 V |
| ModuleBus I/O Capacity | Maximum 96 I/O modules |
| ModuleBus Scan Rate | 0-100 ms depending on I/O configuration |
| CEX Bus Modules | Maximum 12 single CEX bus modules |
| CEX Bus Supply Current | Maximum 2.4 A |
| Protection Class | IP20 according to EN 60529 |
Firmware Flash Compatibility and Industrial Control Communication
The PM856AK01 integrates firmware storage capability through a 2 MB Flash PROM and supports AC 800M controller software execution. The processor communicates through Ethernet-based control networks using MMS and IAC protocols, with two Ethernet channels available for controller-level data exchange.
The module supports firmware and application management within the AC 800M architecture, with storage memory allocation of 16 MB and application RAM availability of 10.337 MB. The controller supports distributed I/O communication through ModuleBus and CEX Bus expansion interfaces.
The hardware design supports firmware flash compatibility management, ensuring installed controller software versions correspond with supported AC 800M engineering environments.
Frequently Asked Questions
Q: Does the PM856AK01 support redundant processor configuration?
A: No. The PM856AK01 is specified as a non-redundant processor unit. Redundant processor operation is not supported for this model.
Q: What type of communication interfaces are available on the PM856AK01?
A: The processor provides two Ethernet channels using IEEE 802.3 Ethernet interfaces and two RS-232C interfaces for general communication and service tool connection.
Q: What is the maximum ModuleBus I/O capacity supported by this processor?
A: The PM856AK01 supports up to 96 I/O modules on the ModuleBus, with the actual scan performance depending on the connected I/O configuration.
Field Installation Guidelines
Install the PM856AK01 on the designated AC 800M controller baseplate and verify correct mechanical engagement before applying power.
Ensure the 24 VDC supply wiring follows industrial control panel practices, including correct polarity, protective grounding, and separation from high-voltage switching circuits.
Ethernet and RS-232C communication cables should be routed separately from power conductors to reduce electromagnetic interference. Shielded communication cable installation and proper cabinet grounding should follow the applicable installation standards of the control system.
Maintain operating conditions within the specified environmental limits, including temperature, humidity, vibration, and pollution degree requirements. Verify ModuleBus and CEX Bus connections before controller startup.
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