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Description
ABB PM851A Processor Unit
The ABB PM851A 3BSE066484R1, also cataloged as the PM851A Processor Unit, operates as a dedicated hardware component for control logic execution, communication management, and system diagnostics within the ABB AC 800M controller platform.
Hardware Specifications
Parameter
Specification
Model
PM851A
Brand
ABB
Origin
Sweden
Power Consumption
Low power consumption profile for AC 800M entry-level processor units
Product Type
Processor Unit
Product ID / Part Number
3BSE066484R1
Controller Family
ABB AC 800M
Processor Clock Frequency
24 MHz
Memory (RAM)
8 MB
CPU Redundancy
Not supported; single CPU configuration
Ethernet Ports
2 integrated Ethernet communication ports
Serial Communication
1 x RS-232C COM port
Mounting Method
DIN rail mounting through compatible BasePlate
Protection Class
IP20
Engineering Tool Compatibility
ABB Control Builder
Programming Standard
IEC 61131-3 compliant languages including FBD, ST, IL, LD, and SFC
Industrial Control Communication and Firmware Compatibility
The ABB PM851A integrates into the AC 800M automation architecture through controller backplane communication and Ethernet-based system interfaces. It manages application execution, controller diagnostics, and data exchange between engineering tools, operator interfaces, and connected automation devices.
Furthermore, the processor supports ABB Control Builder programming environments and IEC 61131-3 application development. The 8 MB RAM capacity provides the required execution memory for compact control applications within single CPU configurations.
The AC 800M platform architecture supports firmware-controlled functionality, allowing application compatibility between processor hardware revisions and approved system software packages. Configuration management requires matching controller firmware, engineering tools, and installed communication modules.
Frequently Asked Questions
Q: Does the PM851A support CPU redundancy configurations? A: No. The PM851A operates as a single processor unit and does not support redundant CPU configurations.
Q: What communication interfaces are integrated into the PM851A? A: The processor includes two Ethernet ports for system communication and diagnostics, plus one RS-232C serial communication port.
Q: Can the PM851A be installed directly on a DIN rail? A: The PM851A requires installation through a compatible AC 800M BasePlate assembly for DIN rail mounting within the controller cabinet.
Field Installation Guidelines
Install the PM851A on the specified AC 800M BasePlate before connecting field wiring or communication interfaces.
Verify that the cabinet environment meets the processor unit operating requirements before energizing the controller system.
Route Ethernet and serial communication cables separately from high-voltage power conductors to reduce electrical interference.
Connect cable shields according to site grounding practices and maintain proper cabinet grounding continuity.
Confirm firmware compatibility between the PM851A processor, Control Builder engineering software, and connected AC 800M modules before commissioning.
Check connector seating and mechanical fixation after installation to prevent intermittent communication faults.
