Description

ABB PM861AK02 Redundant Processor Unit

The ABB PM861AK02, also cataloged as the PM861A Redundant Processor Unit, operates as a dedicated hardware component for redundant CPU execution and controller synchronization within ABB System 800xA automation platforms. The kit contains dual processor units, baseplates, communication cables, terminators, and memory backup batteries for redundant control configurations.

Hardware Specifications

Parameter	Specification
Model	PM861AK02
Brand	ABB
Product Type	Central Unit / Redundant Processor Unit
Origin	Sweden
Weight	2.9 kg
Dimensions	135 mm depth x 186 mm height x 119 mm width
Processor Configuration	Redundant PM861A CPU configuration
Redundancy Function	Dual processor synchronization
Communication Components	TK850 CEX-bus expansion cable, TK851 RCU-Link cable
Baseplate Type	TP830 Baseplate, width 115 mm
Module Termination	TB807 Modulebus terminator
Memory Backup	Lithium battery backup, 1 battery per CPU
Battery Quantity	2
Battery Weight	9 g each

ABB Industrial Control Bus and Redundant CPU Architecture

The PM861AK02 integrates redundant processor communication through ABB controller infrastructure. Therefore, the unit uses dedicated RCU-Link and CEX-bus connections to maintain synchronization between processor units. The redundant architecture supports continuous controller operation by coordinating CPU states and memory conditions.

Furthermore, the processor kit uses ABB backplane bus communication mechanisms for distributed I/O interaction and controller data exchange. The dual PM861A processor arrangement enables I/O density scaling within compatible ABB System 800xA controller installations while maintaining synchronized execution states.

The included TP830 baseplates provide mechanical mounting and electrical connection interfaces for the processor units. Additionally, the TB807 Modulebus terminators complete the communication bus termination requirements.

Frequently Asked Questions

Q: Does the PM861AK02 include a single processor or a redundant processor pair?
A: The PM861AK02 is supplied as a redundant processor unit kit containing two PM861A CPU units with supporting synchronization hardware.

Q: What cables are included with the PM861AK02 kit?
A: The kit includes TK850 CEX-bus expansion cables and TK851 RCU-Link cables for redundant processor communication.

Q: Does the PM861AK02 contain internal battery backup components?
A: Yes. The kit includes lithium memory backup batteries, with one battery installed for each PM861A processor unit.

Field Installation Guidelines

• Install the PM861AK02 on the specified ABB controller mounting arrangement using the supplied TP830 baseplates.
• Verify correct connection of TK850 CEX-bus expansion cables and TK851 RCU-Link cables before controller startup.
• Install TB807 Modulebus terminators according to the ABB system configuration requirements.
• Maintain proper grounding and cable separation between communication wiring and high-voltage power conductors.
• Check battery installation status before commissioning to ensure memory backup functionality.
• Confirm firmware compatibility between redundant processor units before system operation.

Specifications

• Brand: ABB

Advantages

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