7/11/2010 6:26 PM | |
Posts: 81 Rating: (1) |
can you add your plc programme here ?i can check it and i may help you. |
7/11/2010 7:10 PM | |
Joined: 12/11/2009 Last visit: 9/8/2022 Posts: 243 Rating: (4) |
my program is not working. and it's for profibus communication. that means it's useless for this project. |
7/12/2010 2:59 PM | |
Joined: 8/25/2005 Last visit: 7/5/2024 Posts: 1161 Rating: (110) |
Hello Osman_, about umg503 I found the information that it supports Profibus DP communication (DPV0 / PDV1) or Modbus RTU. I haven't done such a configuration. Are you interested in finding out the reasons why the first configuration wasn't running? Or are you looking for an alternative. Think Modbus is the more complex solution. Maybe you first problems could be solved by a lower transmission rate or better terminating, ... So please provide more information about your configuration Good luck Sabine |
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7/12/2010 7:34 PM | |
Joined: 9/27/2006 Last visit: 8/12/2024 Posts: 12275 Rating: (2680) |
Hello Osman_; The reason we are concentrating on the Profibus-DP connection is, as you mentionned, that it is the easieast way to connect to your Janitza slave, far easier (and cheaper) than the Modbus master on a CP 341. And our experience is that unless there is some kind of a problem in the hardware setup (generally) you should not have this limitation of less than 10 units before the bus crashes. Believe me, I have worked with more complex units than your energy memer and with far more of them on a single Profibus network without a hitch. Some of these networkshave been stable for almost 10 years now. But a simple error in cabling or termination can bring the whole deal down fast. So, again, we will ask you for your program, as it is, so we can see if there is anything that bothers us inside. We will also request your topology sketch, with details on the Profibus-DP parameters (speed, distances, position of repeaters, termination) that you have used to setup your network. Finally, we would like to look at the contents of your Diagnostic Buffer (when your SF and BusF LEDs are active) so we can have a look at what the CPU finds disturbing in your connections with the Janitzas. This should cover most sources of Profibus errors, andallow us with any luckhelp youfix the problem that is holding back your project. Hope this helps, Daniel Chartier Edit: Have you used the following document from Janitza, showing how to connect a S7-300 as master to a Janitza umg? http://download.janitza.de/download_direkt/Profibus/10160691.pdf It is in German, but any functionnal translator on the web will help you translate it to English (or whichever language you prefer). The demo program looks very standard, with no surprises. D.C. |
Last edited by: dchartier at: 7/12/2010 7:43 PMLocated S7-300/Janitza demo Profibus doc |
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