PROFIBUS Class 1 and Class 2 masters!

Field Network Q&A

Okay, I'm confused. What's the difference between a Class 1 and a Class 2 master on a PROFIBUS network?

Expert’s answer: PROFIBUS Class 1 and Class 2 masters

No, I get it. The answer’s pretty easy, but the logic eludes me too.So, there is a difference between PROFIBUS Class 1 and Class 2 masters. Let me start with the Class 1.

The Class 1 master actively trades data with the slaves, i.e., your field devices. It’s usually a programmable logic controller (PLC), and it sets up the communication speed and controls most of the network. It also offers data passively to the Class 2.

The Class 2 master acts as supervisor for the entire system. Normally a laptop or field device, the Class 2 master can pull data from the Class 1 and the slaves. You use it for commissioning, maintenance, and diagnostics. Now why PROFIBUS calls the top dog “Class 2” I’ll never understand.

Check these companies for more about PROFIBUS network:

Other resources that might interest you

PROFIBUS PA and PROFIBUS DP
What are the advantages of PROFIBUS PA? Can you implement every device in the PROFIBUS DP network?

Terminator on PROFIBUS network
Why do you need a terminator in your PROFIBUS network? And what would happen if it was left out?

Related tags: ABB Class 1 master Class 2 master Endress+Hauser MTL Pepperl+Fuchs PLC Profibus PROFIBUS association Profibus DP Profibus PA SLAVES
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