Overview
Configured for redundant processor execution in the AC 800M Control Network, the ABB PM891K02 (PM891 Processor Unit Kit) provides direct physical and electrical control processing for redundant CPU, CEX-Bus, communication interfaces, and S800 I/O configurations.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PM891K02 |
| Brand | ABB |
| Origin | Sweden |
| Product Type | Processor Unit Kit |
| System Platform | AC 800M Controller / System 800xA |
| Article Number | 3BSE053242R1 |
| Redundancy | Yes |
| High Integrity | No |
| Processor Type | MPC8270 |
| Clock Frequency | 450 MHz |
| Performance | 0.043 ms per 1000 boolean operations |
| Memory | 256 MB |
| RAM Available for Application | 208.985 MB |
| Flash Memory | 16 MB Flash PROM for firmware storage |
| Dimensions | 174 mm W x 186 mm H x 94 mm D |
| Weight | 4000 g including base |
| Operating Temp | 0 deg C to +55 deg C |
| Storage Temperature | -40 deg C to +70 deg C |
| Power Supply | 24 V DC (19.2-30 V DC) |
| Power Consumption | 660 mA typical / 750 mA maximum at +24 V DC |
| Power Dissipation | 15.8 W typical / 18 W maximum |
| Ethernet Channels | 2 RJ45 ports |
| Ethernet Interface | 10/100 Mbit/s |
| Control Network Protocol | MMS and IAC |
| Serial Interface | 1 isolated RS-232C COM4 port |
| CEX-Bus Communication Modules | Maximum 12 modules |
| CEX-Bus Supply Current | Maximum 2.4 A |
| Modulebus I/O Clusters | 7 optical clusters |
| Maximum Modulebus I/O Capacity | 84 modules |
| Modulebus Scan Rate | 0-100 ms depending on I/O configuration |
| Real-Time Clock Stability | 50 ppm |
| Switch Over Time in Redundant Configuration | Maximum 10 ms |
| Built-in Backup Battery | No |
| Protection Class | IP 20 according to EN 60529 |
| Certifications | CE, UL, cULus Class 1 Zone 2, marine certificates ABS/BV/DNV-GL/LR |
Package Contents:
- 2 pcs PM891K01 Processor Unit
- 1 pcs TK850V007 CEX-Bus Extension Cable
- 1 pcs TK855 RCU Data Link Cable
- 1 pcs TK856 RCU Control Link Cable
ABB AC 800M Redundant Processor and Industrial Communication Features
The PM891K02 integrates CPU redundancy functions for AC 800M controller architectures. Therefore, the redundant configuration maintains synchronization between processor units, CEX-Bus communication paths, Control Network interfaces, and S800 I/O connections.
The unit includes two RJ45 Ethernet ports for Control Network communication and one isolated RJ45 serial port for configuration access. Moreover, the COM4 RS-232C interface supports service tool connection through an optically isolated channel without RTS-CTS control.
The integrated CEX-Bus extends communication capacity through additional interface modules. In addition, the BC810 CEX-Bus Interconnection Unit can divide the communication bus into independent segments to increase system availability.
The PM891K02 supports optical Modulebus communication for up to seven S800 I/O clusters. Each cluster can contain up to 12 I/O units, allowing the controller to manage a maximum of 84 I/O modules.
ABB AC 800M controllers use deterministic industrial communication networks. The PM891K02 supports firmware flash storage and hardware identification through a unique Ethernet address assigned to each processor unit.
Frequently Asked Questions
Q: Does the PM891K02 include an internal backup battery?
A: No. The PM891K02 does not contain an internal battery. The real-time clock and controller operation require the specified power supply conditions.
Q: What is the redundancy switching time of the PM891K02 configuration?
A: The redundant configuration provides a maximum switch over time of 10 ms for processor redundancy operation.
Q: Can the PM891K02 use the BC810K02 for CEX-Bus redundancy expansion?
A: Yes. The BC810K02 supports CEX-Bus segmentation and must be ordered separately because it is not included in the PM891K02 redundant processor unit kit.
Field Installation Guidelines
Install the PM891K02 on the specified AC 800M controller mounting arrangement and verify that the power supply polarity matches the 24 V DC input requirements.
Maintain separation between communication cables, power wiring, and high-voltage conductors to reduce electromagnetic interference. Use proper shielding and grounding methods for Ethernet and serial communication connections according to industrial installation practices.
Before connecting CEX-Bus extension cables, confirm correct mechanical alignment and secure cable routing. Avoid excessive cable bending or mechanical stress on communication connectors.
For redundant processor installations, verify that both processor units, communication interfaces, and connected I/O systems operate with matching hardware and firmware configurations before commissioning.
Confirm environmental conditions, enclosure protection, and grounding continuity before applying operating power.
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Contact: Manski Wong +86 18030205725 manski@cambia.cn
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