Description

ABB PM858K02 Redundant Processor Unit

The ABB PM858K02, also cataloged as the PM858K02 Redundant Processor Unit, executes controller processing, communication management, and application task handling within the ABB AC 800M Control System network. This processor module uses redundant CPU configuration with MPC866 architecture, 16 MB memory, and Ethernet based control communication.

Hardware Specifications

Parameter	Specification
Model	PM858K02
Brand	ABB
Origin	Sweden
Product Type	Redundant Processor Units
Article Number	3BSE082896R1
Processor Type	MPC866
Redundancy	Yes
High Integrity	No
Clock Frequency	33 MHz
Performance, 1000 Boolean Operations	0.36 ms
Memory	16 MB
RAM Available for Application	7.147 MB
Flash Memory for Storage	Yes
Firmware Storage	4 MB Flash PROM
Weight	2700 g (5.95 lbs) 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 Supply	24 VDC (19.2-30 VDC)
Power Consumption	210 mA typical / 360 mA maximum at +24 VDC
Power Dissipation	5.1 W typical / 8.6 W maximum
Ethernet Channels	2
Ethernet Interface	IEEE 802.3 Ethernet, 10 Mbit/s, RJ-45 female
Control Network Protocol	MMS and IAC
RS-232C Interfaces	2 ports
CEX Bus Communication Modules	12
Modulebus I/O Capacity	Maximum 84 I/O modules with redundant CPU
Modulebus Scan Rate	0-100 ms depending on I/O configuration
Real-Time Clock Stability	100 ppm
Redundant Configuration Switchover Time	Maximum 10 ms
CE Mark	Yes
Protection Class	IP20 according to EN 60529

Industrial Control Network and Firmware Compatibility

The PM858K02 uses ABB AC 800M controller architecture with redundant processor operation. The processor manages application execution, task scheduling, and communication services through the Control Network interface.

Additionally, the module supports Ethernet communication based on IEEE 802.3 standards and uses MMS and IAC protocols for controller data exchange. The firmware storage uses 4 MB Flash PROM, while application memory provides 7.147 MB RAM capacity.

The redundant configuration supports processor synchronization and rapid switchover operation with a maximum transition time of 10 ms. Furthermore, the controller supports up to 32 applications, 64 programs per application, and 128 diagrams per application.

Frequently Asked Questions

Q: What is the redundancy function of the ABB PM858K02?
A: The PM858K02 supports redundant processor configuration. During processor redundancy operation, the controller performs synchronization between CPUs and provides a maximum switchover time of 10 ms.

Q: What communication interfaces are available on the PM858K02?
A: The processor provides two Ethernet channels with IEEE 802.3 Ethernet communication and two RS-232C interfaces. It also supports CEX bus communication modules and AC 800M Control Network protocols.

Q: What is the power requirement of the PM858K02 processor unit?
A: The module requires a 24 VDC power supply within the range of 19.2-30 VDC. The typical current consumption is 210 mA, with a maximum value of 360 mA at +24 VDC.

Field Installation Guidelines

Install the PM858K02 on the designated AC 800M controller base assembly and verify correct mechanical engagement before applying power.

Maintain proper cabinet grounding and connect protective earth according to industrial control panel standards. Separate communication cables from high-voltage power wiring to reduce electromagnetic interference.

Use shielded communication cables where required by the installation environment. Connect cable shields according to the plant grounding design and avoid unnecessary shield loops.

Before commissioning, verify the 24 VDC supply polarity, redundant power input status, Ethernet network configuration, and controller firmware compatibility.

Ensure ventilation space around the controller assembly and confirm that environmental conditions remain within the specified operating limits.

Specifications

• Brand: ABB

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems