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ABB PM891AK01 3BSE053241R1｜Processor Unit ｜
Hardware Overview
The PM891 is a monolithic processor unit that integrates the power supply, CPU boards, and unit termination into a single hardware assembly. The unit includes:
Microprocessor with onboard RAM memory
Real-time clock
LED status indicators
INIT push button
Secure Digital (SD) interface
No internal battery (battery-less design)
The controller provides:
Two RJ45 Ethernet ports (CN1, CN2) for Control Network communication
One isolated RJ45 serial port (COM4) dedicated to configuration tools
The PM891 supports full CPU redundancy, including redundant CPU operation, CEX-Bus, communication interfaces, and S800 I/O, ensuring high availability for mission-critical industrial applications.
Communication Expansion (CEX-Bus)
The unit features an integrated CEX-Bus, enabling expansion of the onboard communication ports through communication interface modules. Key characteristics include:
Support for redundant communication interfaces on the CEX-Bus
Support for segmented CEX-Bus architectures using the BC810 Interconnection Unit, enhancing availability by dividing the bus into isolated segments
An optical Modulebus interface capable of connecting up to seven clusters of S800 I/O units (each cluster supporting up to 12 units)
Each PM891 includes a unique factory-assigned Ethernet address that provides a permanent hardware identity.
Features and Benefits
High Reliability with simplified diagnostic procedures
Modular Architecture enables step-by-step system expansion
IP20 Protection Class allows installation without an enclosure
Full EMC Certification ensures robust operation in electrically noisy environments
High Performance with Large Application Memory suited for advanced process control
Segmented CEX-Bus using BC810 for enhanced communication availability
Built-in Redundant Ethernet Ports providing network fault tolerance
ABB PM891AK01 3BSE053241R1｜Processor Unit ｜
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By structuring the information in this manner, the article provides a clear and organized understanding of input channels, transducer supply, and communication implementations in distributed control systems.
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