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What is the difference between choosing Profibus PA or Foundation Fieldbus?
For the control and diagnosis of process operation, fieldbus is the most suitable network bus. This is because in applications where real-time requirements are high, fieldbuses can provide highly reliable two-way communication between “smart” devices and systems.
However, different fieldbus technologies have different attributes. To maximize the benefits of fieldbuses, you must make the right selection. The two most widely used fieldbuses in process automation are the Foundation fieldbus and Profibus PA. This course will help you determine which fieldbus is best suited to your needs.
Tip: As you navigate through the topics of this course, keep an eye out for answers to the following questions:
• How is the physical layer of Foundation Fieldbus different from that of Profibus PA?
• Where should control execution be placed in the Foundation fieldbus? What about Profibus PA?
• How can the two fieldbuses be interoperable?

Some of the differences between Profibus PA and Foundation Fieldbus reflect their different origins.
The Profibus protocol family is designed for the communication level of PLC systems, mainly used in discrete manufacturing and building automation. It consists of three protocols, each with its own different functions and applications.
• Profibus FMS is the architecture of the PLC system, used to connect the user interface, PLC and CNC devices, etc.
Profibus DP is mainly used in discrete processes such as product assembly lines, packaging lines, building automation, motor control and material handling systems.
Building on these two earlier protocols, Profibus PA extends the use of Pfofibus to the process industry. The biggest difference between Profibus PA and DP is at the physical layer.
The Foundation Fieldbus, on the other hand, was designed to meet the needs of the process automation industry – including reliable and efficient real-time process control on the bus.
Since Profibus PA and Foundation Fieldbus are both digital buses, they have certain advantages over traditional point-to-point wiring. Some of the advantages are determined by the physical layer characteristics of the bus, while others are determined by the application software of the bus.
We can compare the advantages of Profibus PA and Foundation Fieldbus for each of these applications – and the possible impact on your bus selection.