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Description
ABB PM851 AC 800M Processor Unit
The ABB PM851, also cataloged as the PM851 Processor Unit, operates as a dedicated CPU hardware component for execution control, memory management, and communication tasks within the ABB AC 800M control system platform.
Hardware Specifications
Parameter
Specification
Model
PM851
Brand
ABB
Origin
Not specified
Product Type
Processor Unit / CPU Module
Series
ABB AC 800M Controller Family
Processor Frequency
24 MHz
Memory Capacity
12 MB
Redundancy Support
Non-redundant configuration
High Integrity Support
Not supported
Performance Benchmark
1,000 Boolean operations in 0.46 ms
Dimensions
Width: 119 mm; Height: 186 mm; Depth: 135 mm
Weight
Approximately 1100 g including base
Backplane Bus Communication and Firmware Compatibility
The ABB PM851 uses the AC 800M controller architecture to execute application logic and exchange process data through the controller backplane communication structure. Therefore, the processor manages task scheduling, I/O data handling, and system communication services within the automation hardware tree.
In addition, the PM851 supports ABB controller firmware environments defined for AC 800M platforms. Firmware compatibility depends on the installed controller version and the associated ABB engineering system configuration.
The processor architecture supports industrial control applications requiring coordinated I/O density scaling, distributed signal processing, and deterministic PLC execution cycles.
Frequently Asked Questions
Q: Does the ABB PM851 support controller redundancy configurations? A: No. The PM851 is specified as a non-redundant processor unit and does not provide redundant CPU operation.
Q: What type of control tasks does the PM851 execute? A: The PM851 executes PLC application programs, manages controller memory operations, and processes communication tasks within the AC 800M system.
Q: Can the PM851 operate with standard AC 800M I/O modules? A: Yes. The PM851 is designed for integration with compatible AC 800M hardware modules through the controller system architecture.
Field Installation Guidelines
Install the PM851 on the designated AC 800M controller base according to ABB hardware assembly procedures.
Verify that the controller backplane connections are correctly seated before system power-up.
Use appropriate grounding methods for the controller cabinet to minimize electrical interference.
Separate communication wiring from high-voltage power cables to reduce electromagnetic coupling.
Confirm firmware compatibility between the PM851 processor unit and the installed AC 800M controller software environment before commissioning.
