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What is the differance between Profinet & Ethernet

Thread Starter: nar   Started: 2/6/2009 11:57 AM   Replies: 4

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  2/6/2009, 11:57 AM
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Dear All,

 I have small question What is the main difference between Profinet And Ethernet

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  2/6/2009, 11:48 PM
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Hallo Nar

To be very concise, Profibus protocol sitting on Ethernet Protocols is called as Profinet. It is just that instead of using the RS485 protocol to access the media as in the normal profibus , the  media acess protocols are implemented on Ethernet.

Krish

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  2/7/2009, 3:42 PM
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Hello nar;
If the question is truly important to you, I suggest you look here:
http://www.profibus.com/technology/profinet/overview/

You will find an excellent discussion on the foundations of Profinet, how it uses Ethernet physical layer and protocols to establich connections, how it can be used in 2 different forms at the moment: Profinet-IO and Profinet-CBA.

Hope this helps,
Daniel Chartier



=== Edited by dchartier @ 1/4/2010 1:10 PM [GMT ] ===
Correction of the previous link, did not seem to work anymore

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  2/10/2013, 4:38 AM
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Hi.

I was looking for info about Profinet and I found a summarized doc but much explanatory and easy for understanding, then I'd like to share with you because it can help someone else.



Best regads,
Berg


"Educate the children and it won't be necessary to punish the men."
Pythagoras
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  2/15/2013, 12:06 PM
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The major difference is hardware layer of  slave devices. While the master (PC or PLC) uses a standard NIC hardware, slave devices are using special hardware ASIC FPGA or DSP to route packets from one port to other.
They also need to change data on the fly, while receiving data on one port they exctract data and change/route forward on the fly, you will notice that profinet has some delay for each device.  
A profinet master is cheap running with ordinary NIC, while slave device is very expensive.  
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