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Profibus, communication between two slaves?

Created by: Ton Verra at: 4/24/2008 9:53 AM (8 Replies)

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4/24/2008 9:53 AM	Rate (0)
Ton Verra Gold Member Joined: 4/20/2007 Last visit: 11/7/2024 Posts: 728 Rating: (43)	Hi, Short question. I have two PLC's with Profibus as slaves in a network. Is it possible to communicate directly between these two? Or does the master have to receive the data from one and send it to the other? Thanks in advance, Ton

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4/24/2008 10:32 AM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 11/18/2024 Posts: 12296 Rating: (2691)	Hello Ton; What you are thinking of is called "Direct data Exchange", and there is a lot of information on this type of configuration on the Support webpages. Here is one particularly interesting FAQ that discusses setting up two S7-300 CPU (configured as Profibus slaves) to allow data exchanges between the two. It also comes with a sample project you can study: http://support.automation.siemens.com/WW/view/en/1016961 Hope this helps, Daniel Chartier

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4/24/2008 10:37 AM	Rate (1)
Amy Regular Member Joined: 4/21/2008 Last visit: 3/13/2024 Posts: 12 Rating: (2)	Yes, you can do that. you can use profibus DX communication. the DP slave send data to master and at same time it send data to other slaves.

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4/24/2008 10:41 AM	Rate (0)
Ton Verra Gold Member Joined: 4/20/2007 Last visit: 11/7/2024 Posts: 728 Rating: (43)	Thank you very much. I got some studying to do . Edit: I am not the one programming the Master station. Is it possible to do this without them?
	Last edited by: Ton Verra at: 4/24/2008 10:55 AM
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4/24/2008 11:51 AM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 11/18/2024 Posts: 12296 Rating: (2691)	Hello Ton; You need to have this configuration setup on the Master CPU, I'm afraid. You will have to request that the programmer of the master take DX comms into consideration, and you will need to coordinate to make sure reserved addreses are available for your exchanges. Hope this helps, Daniel Chartier

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4/24/2008 11:54 AM	Rate (0)
Ton Verra Gold Member Joined: 4/20/2007 Last visit: 11/7/2024 Posts: 728 Rating: (43)	Thank you for the info! I'll get into it.

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4/26/2008 1:03 PM	Rate (0)
Ton Verra Gold Member Joined: 4/20/2007 Last visit: 11/7/2024 Posts: 728 Rating: (43)	I was just thinking a bit... What if I use Ethernet? If I got two CPU 313 C with two 343-1 Lean (if I remember right). Would it be any easier?

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4/26/2008 1:10 PM	Rate (0)
INS Gold Member Joined: 4/6/2006 Last visit: 2/5/2024 Posts: 604 Rating: (56)	Hello Ton, Yes that will be easier. You could use the AG_SEND (FC5) and AG_RECV (FC6) form the SIMATIC NET CP Library in Step 7 to communicate between two lean-CP's. About this there is already a very interesting Forum topic. Communication via CP 343-1 Lean
	Best regards, INS
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4/26/2008 4:07 PM	Rate (0)
Ton Verra Gold Member Joined: 4/20/2007 Last visit: 11/7/2024 Posts: 728 Rating: (43)	Thanks a lot, Ill get into that one too

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