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ABB PM891K02 Redundant Processor Unit

Configured for redundant CPU execution and Control Network communication in ABB AC 800M controller platforms, the ABB PM891K02 (PM891 Redundant Processor Unit) provides direct hardware control processing, memory management, and communication handling through integrated CPU, CEX-Bus, and Modulebus interfaces.

Hardware Specifications

Parameter	Specification
Model	PM891K02
Article Number	3BSE053242R1
Brand	ABB
Product Type	Redundant Processor Unit
Origin	Sweden
Weight	4000 g including base
Dimensions	Width 174 mm, Height 186 mm, Depth 94 mm
Operating Temp	Not specified
Power Consumption	15.8 W typical, 18 W maximum
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 for Storage	Yes
Firmware Storage	16 MB Flash PROM
Power Supply	24 V DC (19.2-30 V DC)
Power Supply Current	660 mA typical, 750 mA maximum at +24 V
Backup Battery	No internal battery
Ethernet Channels	2
Ethernet Interface	10/100 Mbit/s
Control Network Protocol	MMS and IAC
Serial Interface	COM4 RS-232C, opto isolated
CEX-Bus Communication Modules	Maximum 12
CEX-Bus Supply Current	Maximum 2.4 A
Modulebus Capacity	Maximum 84 S800 I/O modules
Modulebus I/O Clusters	7 optical clusters
Modulebus Scan Rate	0-100 ms depending on I/O configuration
CPU Switch Over Time	Maximum 10 ms in redundant configuration

ABB AC 800M Redundant Control Architecture

The PM891K02 integrates CPU redundancy functions across processor units, CEX-Bus communication paths, communication interfaces, and S800 I/O connections. The unit contains the CPU board, power supply section, and termination components in a single enclosure.

The processor includes a microprocessor, RAM memory, real-time clock, LED indicators, INIT push button, and Secure Digital interface. Furthermore, the design removes the requirement for an internal backup battery while maintaining controller identity through a unique Ethernet address.

The integrated CEX-Bus extends communication capability through external interface units. In addition, the BC810 CEX-Bus Interconnection Unit can divide communication segments to increase system availability. The PM891K02 supports redundant communication interfaces connected through the CEX-Bus structure.

The optical Modulebus interface connects S800 I/O clusters. Each controller supports up to seven optical clusters, with each cluster supporting up to 12 S800 I/O units. Therefore, the controller can manage a maximum of 84 connected I/O modules.

Firmware Flash Compatibility and Industrial Network Communication

The PM891K02 uses firmware storage through Flash PROM and supports Secure Digital service functions for controller maintenance operations. The processor communicates through the AC 800M Control Network using MMS and IAC protocols.

The dual Ethernet ports provide 10/100 Mbit/s network communication for controller-to-controller and system communication functions. Moreover, the controller supports deterministic industrial Ethernet architectures with switched Ethernet backbone configurations.

The processor supports firmware-based hardware identification through a unique Ethernet address. This function allows the controller unit to maintain individual identification within AC 800M automation systems.

Frequently Asked Questions

Q: Does the PM891K02 support CPU redundancy functions?
A: Yes. The PM891K02 supports redundant CPU operation including CPU synchronization, CEX-Bus communication interfaces, and S800 I/O communication paths.

Q: Does the PM891K02 contain an internal backup battery?
A: No. The PM891K02 does not include an internal battery. Time synchronization and controller operation are managed through the integrated hardware design.

Q: What communication interfaces are available on the PM891K02?
A: The unit provides two RJ45 Ethernet ports for Control Network connection and one isolated RJ45 RS-232C COM4 service port for configuration tools.

Field Installation Guidelines

Install the PM891K02 on the designated AC 800M controller mounting arrangement with correct mechanical alignment and termination connection.

Connect the 24 V DC power supply according to ABB installation requirements. Verify supply polarity and confirm that redundant power monitoring signals are correctly wired before controller startup.

Use shielded communication cables for Ethernet and serial connections. Route communication wiring separately from high-current power cables to reduce electrical interference.

When installing redundant processor configurations, verify that all required CEX-Bus, RCU Data Link, and RCU Control Link connections are correctly installed.

The BC810K02 CEX-Bus Interconnection Unit is not included in the PM891K02 kit. A separate BC810K02 installation is required when hot replacement functionality is required.

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