Overview
Configured for controller execution and application processing in the AC 800M control system, the ABB PM856AK01 (PM856AK01 Processor Unit) provides direct physical/electrical execution for PLC application tasks, I/O communication, and Ethernet-based control network functions.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PM856AK01 (3BSE066490R1) |
| 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 |
| Flash PROM for Firmware Storage | 2 MB |
| Redundancy | No |
| High Integrity | No |
| Power Supply | 24 VDC (19.2-30 VDC) |
| Power Consumption | 180 mA typical / 300 mA maximum at +24 VDC |
| Power Dissipation | 4.32 W typical / 7.2 W maximum |
| Ethernet Channels | 2 |
| Ethernet Interface | IEEE 802.3 Ethernet, 10 Mbit/s, RJ-45 female |
| RS-232C Interfaces | 2 (general and service tool) |
| CEX Bus Modules | Maximum 12 single CEX bus modules |
| Modulebus I/O Capacity | Maximum 96 I/O modules |
| Modulebus Scan Rate | 0-100 ms depending on I/O configuration |
| I/O Clusters | 1 electrical and 7 optical clusters with non-redundant CPU |
| No. of Applications per Controller | 32 |
| No. of Programs per Application | 64 |
| No. of Diagrams per Application | 128 |
| No. of Tasks per Controller | 32 |
| Number of Cycle Times | 32 |
| Application Program Cycle Time | Down to 1 ms |
| Built-in Backup Battery | Lithium 3.6 V |
| Event Queue Capacity | Up to 3000 events per OPC client |
| Operating Temperature | 0 to +55 deg C |
| Storage Temperature | -40 to +70 deg C |
| Relative Humidity | 5 to 95 %, non-condensing |
| Protection Class | IP20 |
| Dimensions | 119 x 186 x 135 mm |
| Weight | 1100 g including base |
Firmware Flash Compatibility and AC 800M Controller Processing
The PM856AK01 uses firmware storage through a dedicated 2 MB Flash PROM and supports application execution within the AC 800M controller architecture. Firmware and application handling are performed through the controller memory system, with configuration data managed through the Control Builder environment. The processor supports Ethernet-based communication using MMS (Manufacturing Message Service) and IAC (Inter Application Communication) protocols.
The controller provides two Ethernet communication channels and supports synchronization between AC 800M controllers through the CNCP protocol with a clock synchronization accuracy of 1 ms. The unit supports CEX bus expansion and Modulebus communication for connected I/O modules.
Frequently Asked Questions
Q: Does the PM856AK01 support CPU redundancy configuration?
A: No. The PM856AK01 is specified as a non-redundant processor unit and does not provide redundant CPU switch-over operation.
Q: What type of field communication interfaces are integrated in the PM856AK01?
A: The unit includes two Ethernet channels based on IEEE 802.3 Ethernet and two RS-232C interfaces for general communication and service tool connection.
Q: How is firmware stored in the processor unit?
A: Firmware storage is provided through a 2 MB Flash PROM integrated in the processor hardware.
Field Installation Guidelines
- Install the PM856AK01 on the specified AC 800M mounting base and ensure correct mechanical locking before energizing the controller system.
- Connect the 24 VDC supply according to the specified polarity and verify power supply voltage stability before operation.
- Keep Ethernet and RS-232C communication cables separated from high-voltage power wiring to reduce electromagnetic interference.
- Use appropriate shield grounding practices for communication cables according to the cabinet design and industrial EMC requirements.
- Confirm Modulebus and CEX bus connections are correctly seated before controller startup.
- Maintain the specified environmental conditions, including temperature, humidity, and pollution degree limits, during installation and operation.
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