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.

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