6/25/2010 8:37 PM | |
Joined: 9/27/2006 Last visit: 9/20/2024 Posts: 12282 Rating: (2684) |
Hello bk23dz; With "Direct Data Exchange" you can havea secondDP master read the slave's inputs configured directly on another DP master, as long as they share the same bus. But only one master (the one holding the "true" Profibus-DP configuration of the slave) can write to the slave's outputs. Have a look at the following FAQ: Reading the input data of a DP slave configured by a different DP master: IM 153 modules capable of Direct Data Exchange: 6ES7 153-1AA03-0XB0 - IM 153-1, distributed, PROFIBUS-DP 6ES7 153-1AA83-0XB0 - IM 153-1, distributed, PROFIBUS-DP http://support.automation.siemens.com/WW/view/en/19081112 Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 6/25/2010 8:38 PM |
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6/26/2010 1:12 AM | |
Joined: 9/27/2006 Last visit: 9/20/2024 Posts: 12282 Rating: (2684) |
Hello bk23dz; Glad to contradict you (well, that doesn't happen everyday ;-) ), but the following FAQ does state that WinAC RTX (at least an earlier version) does support Direst Data Exchange as a DP-Master. http://support.automation.siemens.com/WW/view/en/17660809 Best re-check your source... maybe we'll need to confirm this one way or the other. Hope this helps, Daniel Chartier |
6/26/2010 3:59 AM | |
Joined: 9/27/2006 Last visit: 9/20/2024 Posts: 12282 Rating: (2684) |
Hello bk23dz; Well, I dug a little further, and unfortunately, it seems that WinLC RTX supports Direct Data Exchange only with a hardnet comm processor, e.g. a CP 5613 or CP 5614 for Profibus: Configuring Direct Data Exchange The CP 5613/CP 5614 supports direct data exchange during cyclic polling. Only specially designed DP slaves (publishers/subscribers) are capable of direct data exchange. In direct data exchange, the publisher (transmitting slave) sends the response data with a special identifier and special timing so that not only the DP master but also the other DP slaves (subscribers) can listen in. You configure direct data exchange with STEP 7/NCM. http://support.automation.siemens.com/WW/view/en/1653531 |
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