9/13/2012 5:39 PM | |
Joined: 9/27/2006 Last visit: 9/20/2024 Posts: 12282 Rating: (2684) |
Hello Pedro; As you can see from the fist link, you can operate the DPV1 slave with a DPV0 master; of course you must accept the fact that yu woill be limited to cyclic data exchanges and basic diagnostics, as described in the DPV0 standard. The second link shows a recent discussion on the subject, and present slinks to more information: Master-slave relations with respect to DP standards (DPV0, DPV1, ...) Difference between DP V0, DP V1 and DP V2 Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 9/13/2012 5:39 PM |
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9/13/2012 5:45 PM | |
Posts: 1547 Rating: (129)
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Hello, itshould be possible to mix these two modes. I found some information where this configuration is explained: http://support.automation.siemens.com/WW/view/en/27248977 http://support.automation.siemens.com/WW/view/en/24163090 |
9/13/2012 11:26 PM | |
Joined: 9/27/2006 Last visit: 9/20/2024 Posts: 12282 Rating: (2684) |
Hello Pedro; I must admit I am confused, I think I remember having done this exact setup in one of my projects using a DPV0 SST Profibus master (on a Controllogix CPU) exchanging data with DPV1 Auma valve controllers, with the exchanges limited to cyclic data. But that was more than 6 years ago, so I just can't be sure right now. I find discussions on the web that support what I stated earlier: http://www.profibus.com/community/forum/discussion-board/?tx_mmforum_pi1%5Baction%5D=list_post&tx_mmforum_pi1%5Btid%5D=824&tx_mmforum_pi1%5Bfid%5D=2 http://www.profibus.com/community/forum/discussion-board/?tx_mmforum_pi1%5Baction%5D=list_post&tx_mmforum_pi1%5Btid%5D=382&tx_mmforum_pi1%5Bfid%5D=2 even though you are right, the link I sent earlier does seem to state that a DPV0 master should not connect to a DPV1 slave... So yes, I am a bit confused. And asI have no available equipment to test oit one way or the other at this time, I cannot vaildate either outcome. Does any one else on the forum have better memory than I do, or a working system that could answer this question? Regards, Daniel Chartier |
9/14/2012 4:11 AM | |
Joined: 10/7/2005 Last visit: 9/21/2024 Posts: 3021 Rating: (1054)
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Dear all the various available info can indeed be confusing (it is "clear as mud" as they say) and here's my take on things: DP-V1 capable Slaves can be operated on DP-V0 Masters but will then behaveas aDP-V0 Slaves. The arguablyconfusing table in Entry ID:19622470 simply tries to point out that you cannot operate aSlave in DP-V1 mode on a DP-V0 Master (at least I believe that that is the intend of this table). The manual Changing from EN50170 to DPV1 also confirms this onpage 4 where it essentially states that you can use DP-V1 slaves without restrictions on a DP-V0 Master (the DPV1 slaves then simply behave like DP-V0Slaves). I can also testify that I've operated numerous DP-V1 capable Slaves as DP-V0 Slaves onDP-VO Masters without any problems. Alot of people would have doneso without realising whenever they use CP342-5 as a DP Master (whichis only DP-V0 capable) and connectedDP-V1 capableSlaves on it. Having said all the above, not all DP Slaves are created equally. Since DP Slave certification is optional instead ofmandatory, you may have a DP Slave that simply "insists" on operating in DP-V1 mode and for exampel issuesDP-V1 related Alarm messages (or interrupts) which your DP-V0 Master can not handle. Step 7 HWconfig would check the GSD file to see if the DP-V1 Slave will also operatein DP-V0 mode and warn you if this is not the case. Other DP Master configuration tools may notdo this though, so the question is: What is your DP (V0) Master and what DP (V1) Slaves do you operate on it? Note that a fair amount of DP Slave manufactures also provide dedicated DP-V0 GSD files for their DP-V1 capable Slaves, so perhaps this is available for your DP Slaves too and may fix your problem. I hope this helps |
Cheers |
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