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5/18/2010 1:34 AM | |
Joined: 7/2/2008 Last visit: 7/2/2024 Posts: 928 Rating: (306) |
Hello samkcr, The MPI/DP interface of 414-H CPU can't work as a DP slave. So, you will need 2 DP/DP couplers and configure both systems as Profibus masters. Best regards. H-H |
5/18/2010 4:23 PM | |
Joined: 9/27/2006 Last visit: 7/14/2024 Posts: 12268 Rating: (2675) |
Hello samkcr; The Areva system can only act as a Profibus master. The S7-400H consists of 2 CPUs that cannot be configure as Profibus slaves; they must therefore be configured as Profibus masters. To make communications between Profibus masters simple, Siemens has implemented a special Profibuis slave, the DP/DP coupler. It has 2 Profibus slave ports, each one connected to a different Profibus network. In your case, one port of the DP/DP coupler would be a slave to the Areva system, the other one would be a slave to one of the S7-400H CPUs. (Note that in your case you would need 2 couplers, one for each of the S7-400H CPUs, each connected to the Areva system). Say you want to read 120 bytes from the S7-400H CPUs in the Areva system. Since the DP/DP coupler is configured as a slave to both masters, you configure a block of 120 bytes IN inside the Areva Profibus configurator for its DP/DP coupler slave, while you configure a block of 120 bytes OUT in the Step 7 configurator (for the S7-400H) for the same slave. That way, everytime the S7-400H writes these 120 bytes to the DP/DP coupler slave, the Areva system reads them in. The only limitatioon of the DP/DP coupler is that you can only conigure a maximum of 244 bytes OUT/244 bytes IN for data exchanges (this is the maximum a single Profibus-DP slave is allowed to transfer). Have a look at the DP/DP coupler manual that you can download here: http://support.automation.siemens.com/WW/view/en/1179382 Hope this helps, Daniel Chartier |
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