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Reading data from another DP node

Created by: Kolma at: 5/24/2006 9:00 AM (8 Replies)

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5/24/2006 9:00 AM	Rate (0)
Kolma Posts: 57 Rating: (1)	Hello! I have two plc 313c-2dp conected in grid (diffferent adresses) and I would like to read data on PLC 1 from PLC 2 (copy data from PLC2 into db in PLC1). Because I need to show data from both PLCs on one TP177A. How can I do that? Thank you, Kolma
Kolma Posts: 57 Rating: (1)
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5/24/2006 9:40 AM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 11/4/2024 Posts: 8763 Rating: (1170)	Hi Kolma, The two S7-300 CPU's are slaves on the network? And the TP177A is connected to PLC1 by MPI or Profibus? Best regards, Wizard

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5/24/2006 9:48 AM	Rate (0)
Kolma Posts: 57 Rating: (1)	Hello! PLCs are masters and both has one slave.They can be connected over MPI or DP. I don't care. But TP177A is connected on PLC 1 on profibus
Kolma Posts: 57 Rating: (1)
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5/24/2006 9:54 AM	Rate (0)
Jeebs Posts: 218 Rating: (28)	Kolma, If these PLC's are already connected to eachother via MPI or Profibus,you don't need to transfer data between the PLC's. You need to configure multiple connections in your WinCC project, each connection according to each PLCand then whenlinking the tags with the proper connectionyou can read data from more than 1 PLC. Hope this helps. Jeebs
Jeebs Posts: 218 Rating: (28)
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5/24/2006 10:02 AM	Rate (0)
Kolma Posts: 57 Rating: (1)	Jeebs, I don't understand. I have only one TP177A connected over profibusto CPU 1, but on that one I must show data from CPU1 and CPU2. Thanks, Kolma
Kolma Posts: 57 Rating: (1)
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5/24/2006 10:30 AM	Rate (0)
@JesperMP Posts: 54 Rating: (5)	Hi Kolma. Like Jeebs says, the simplest solution is to configure 2 PLC controllers in the TP177 project. In case you are not aware of this, then you should know that there can be several PLCs configured for an OP/TP. As you are mixing several masters and slaves on the same Profibus, you should have all the Profibus devices (PLCs, OPs, others) integrated into the same STEP7 project. In that way the Profibus configuration will be taken care of automatically by STEP7. It is not easy to exchange data over Profibus between the the 313C-2DP's. The integrated DP port in the two 313C PLCs have a limited functionality. You cannot configure direct dataexchange (a "connection") between the two PLCs for example when they are both configured as masters.
@JesperMP Posts: 54 Rating: (5)
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5/24/2006 10:43 AM	Rate (0)
Jeebs Posts: 218 Rating: (28)	Kolma, As Jesper said. It's easier to configure the connections in the TP. I have included some Screenshots of how it is supposed to look. The screenshots are taken from a project withtwo S7-313C 2DP andone TP177A in a Profibus network. Hope this helps a lil better. Jeebs Attachment Connections.zip (900 Downloads)
Jeebs Posts: 218 Rating: (28)
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5/24/2006 11:03 AM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 11/4/2024 Posts: 8763 Rating: (1170)	Hi, Since you have two Profibus masters there are some possibilities: * Use a DP/DP koppler to make a connection between both profibus network. You can communicate data from one network to the other. * Make a MPI network and let the CPU's communicate data with each other. The following link gives the different possibilities: http://support.automation.siemens.com/WW/view/en/21537047 * Make a MPI network and make two connections in the panel. One should use routing, because the panel is connected to profibus and PLC2 is connected to MPI. See following link: http://support.automation.siemens.com/WW/view/en/22257781 Hope this will help you. Best regards, Wizard

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5/24/2006 11:04 AM	Rate (0)
Kolma Posts: 57 Rating: (1)	Thank you all! While waiting for your answers I realized how do you mean. This is really the simplest way. Again, thank you
Kolma Posts: 57 Rating: (1)
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