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ABB PM856AK01 Processor Unit

The ABB PM856AK01 3BSE018128R1, also cataloged as the PM856AK01 Processor Unit, operates as a dedicated hardware component for real-time control execution and communication management within the ABB AC 800M Controller platform.

Hardware Specifications

Parameter	Specification
Model	PM856AK01 3BSE018128R1
Brand	ABB
Product Type	Processor Unit / CPU Module
System Platform	AC 800M Controller
Origin	Sweden
Operating Temp	+5 deg C to +55 deg C
Power Consumption	Supplied through AC 800M system power distribution, value not specified
Processor	Motorola PowerPC based CPU architecture
Memory	32 MB RAM
Flash Memory	Integrated non-volatile flash memory
Communication Ports	2 x Ethernet ports, serial COM interfaces
Mounting Type	DIN rail mounting with TB850 base plate
Protection Class	IP20
Redundancy Support	Supports CPU redundancy configuration with compatible redundant hardware
Power Supply Voltage	Typical 24 VDC system supply
Certifications	CE, cULus, RoHS compliance

ABB AC 800M Backplane and Communication Architecture

The PM856AK01 integrates into the ABB AC 800M controller architecture through the controller backplane and Ethernet communication interfaces. The processor executes application logic, manages I/O data exchange, and handles diagnostic information from connected system components.

Furthermore, the module supports deterministic industrial communication functions through dual Ethernet ports. These interfaces provide Control Network connectivity, MMS communication, and peer-to-peer data exchange between AC 800M controller nodes.

The firmware resides in internal flash memory, allowing storage of controller operating software and application-related data. The processor module also supports redundancy configurations when installed with the required redundant controller hardware.

Frequently Asked Questions

Q: Does the PM856AK01 support redundant CPU operation?
A: The PM856AK01 supports CPU redundancy when installed with the corresponding redundant base hardware and a compatible processor module configuration.

Q: What communication interfaces are available on the PM856AK01?
A: The module provides two Ethernet ports for AC 800M Control Network communication and additional serial interfaces for supported communication functions.

Q: Can the PM856AK01 operate without a separate power supply module?
A: The PM856AK01 receives system power through the AC 800M controller power distribution arrangement and does not use an independent external power input.

Field Installation Guidelines

• Install the PM856AK01 on the specified AC 800M DIN rail mounting arrangement with the correct base plate configuration.
• Verify that the controller backplane connections are fully engaged before applying system power.
• Route Ethernet communication cables separately from high-voltage and high-current wiring to reduce electrical interference.
• Connect cable shields according to the plant grounding standard and maintain proper EMC practices.
• Confirm firmware compatibility before replacing an installed processor module.
• Use approved configuration tools to verify controller communication status after installation.

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