Overview
Configured for redundant control execution in the AC 800M Control Network, the ABB PM858K02 (PM858K02 Processor Unit) provides direct physical and electrical processing functions for controller tasks, I/O communication, and application execution.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PM858K02 |
| Article Number | 3BSE082896R1 |
| Brand | ABB |
| Product Type | Redundant Processor Unit |
| System Platform | AC 800M |
| Origin | Sweden |
| Weight | 2700 g including base |
| Dimensions | 119 mm W x 186 mm H x 135 mm D |
| Operating Temp | 0 to +55 deg C |
| Storage Temp | -40 to +70 deg C |
| Power Consumption | 210 mA typ / 360 mA max at 24 V DC |
| Power Dissipation | 5.1 W typical / 8.6 W max |
| Processor Type | MPC866 |
| Clock Frequency | 33 MHz |
| Application Memory | 16 MB |
| RAM Available for Application | 7.147 MB |
| Flash Memory | 4 MB firmware storage |
| Redundancy Function | Yes |
| Redundancy Switch Over Time | Max 10 ms |
| Performance | 0.36 ms per 1000 boolean operations |
| Applications per Controller | 32 |
| Programs per Application | 64 |
| Diagrams per Application | 128 |
| Tasks per Controller | 32 |
| Application Cycle Time | Down to 1 ms |
| Ethernet Interface | 2 channels, IEEE 802.3, 10 Mbit/s, RJ-45 |
| Control Network Protocol | MMS and IAC |
| RS-232C Interface | 2 ports |
| CEX Bus Communication Modules | Max 12 |
| Modulebus I/O Capacity | Max 84 I/O modules in redundant configuration |
| Modulebus Scan Rate | 0 – 100 ms depending on I/O configuration |
| Backup Battery | Lithium 3.6 V |
| Protection Class | IP20 according to EN 60529 |
| Rated Isolation Voltage | 500 V AC |
| Certifications | CE, ISA Secure, DNV-GL Marine, cULus Class 1 Zone 2 |
Industrial Control Network and Firmware Compatibility
The PM858K02 operates as a redundant AC 800M processor unit and manages controller applications through deterministic execution cycles. Moreover, the unit supports firmware storage through internal Flash PROM and maintains controller configuration data through dedicated memory resources.
The processor communicates through Ethernet-based Control Network interfaces using MMS and IAC protocols. In addition, the module supports CEX bus expansion and Modulebus communication for distributed I/O structures.
The redundant configuration provides a maximum switch-over time of 10 ms. Therefore, controller synchronization and application continuity remain controlled during processor redundancy transitions.
The ABB AC 800M platform uses backplane bus communication management, I/O density scaling, and firmware flash compatibility mechanisms to coordinate processor, communication modules, and field I/O resources. The PM858K02 supports these hardware integration functions through its redundant CPU architecture.
Frequently Asked Questions
Q: What redundancy function does the ABB PM858K02 provide?
A: The PM858K02 supports redundant processor configuration with a maximum switch-over time of 10 ms between redundant controller units.
Q: How does the PM858K02 connect with external I/O modules?
A: The processor communicates with I/O systems through Modulebus connections and supports up to 84 I/O modules in redundant CPU configurations.
Q: What power supply range does the PM858K02 require?
A: The unit operates with a 24 V DC power supply input range from 19.2 to 30 V DC.
Field Installation Guidelines
Install the PM858K02 on the designated AC 800M controller mounting base and verify correct mechanical engagement before applying power.
Ensure that the 24 V DC supply wiring follows industrial control cabinet standards, including proper polarity verification and protective grounding practices.
Route Ethernet and RS-232C communication cables separately from high-voltage power conductors to reduce electrical interference. Use suitable shielding and grounding methods according to the control cabinet design requirements.
Before commissioning, verify redundancy configuration, controller synchronization status, firmware compatibility, and connected Modulebus I/O addressing.
Maintain environmental conditions within the specified operating temperature, humidity, vibration, and pollution limits defined for the AC 800M installation environment.
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