8/9/2009 9:33 AM | |
Joined: 9/27/2006 Last visit: 9/4/2024 Posts: 12282 Rating:
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Hello trialghost; As you seem to be new here, I will explain how you can locate the information yourself. When a manual is suggested, please start by opening it. If you do not have it with you, you can locatein the Product Support link that you will find at the top of this page. Use the search box, and you can refine the search by clicking on Manuals, FAQs, Downloads.... For instance, here is a link to the Diagnostic Repeater manual that I suggested earlier: http://support.automation.siemens.com/WW/view/en/7915183 Chapter 7.4 is dedicated to accessing the topology of your bus: Procedure [Bus topology] 1. In STEP 7 select the DP master system whose data you want to read. 2. Start the function by choosing the menu command View > Display > All Stations/Only Diagnostic Repeater with Stations/All Diagnostic Repeaters Only.Procedure [Topology table] 1. In the topology display, select the diagnostic repeater whose data you want to read. 2. Start the function by choosing the View > Topology table menu command.Procedure [Diagnostic Buffer info on the Reapeater] 1. In the topology display, select the diagnostic repeater whose data you want to read. 2. Start the function by choosing the Options > Diagnostic buffer menu command. |
8/10/2009 5:40 AM | |
Joined: 10/7/2005 Last visit: 9/5/2024 Posts: 3018 Rating:
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Yes it is and and just in case you have not located this yourself already,chapter 7.3 of the manual is dedicated to this. You can also trigger a topology detection from your S7program via SFC103 "DP_TOPOL". And onelast thing: Please make sure to adhere tothe design guidelines and be aware of the limitations (see chapter 3 of the manual for more)to ensure you get the results that you needfrom the Diag repeater. |
Cheers |
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8/11/2009 9:59 AM | |
Joined: 10/7/2005 Last visit: 9/5/2024 Posts: 3018 Rating:
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SFC's (or SFB's for that matter) are part of your S7 CPU's Operating system and as suchalready "exist" in you CPU (you can not - nor need to - download them). The "System Function Blocks" library in Step7 "merely" contains them so you can callwhichever one you need inyour S7 logic(the library really just provides you with a call interface for them, they are nonethess additonally marked as Know How protected). Bottom line, don't worry that they appear to be empty, they'll work as outlined in their associated help (highlight SFC1 in the library or your project and hit <F1> to get to the inbuilt help for it). Ihope this helps |
Cheers |
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8/14/2009 3:29 PM | |
Joined: 10/7/2005 Last visit: 9/5/2024 Posts: 3018 Rating:
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or it's because of an incrompehensible answer on my behalf
my answerdepends on what baudrate you want to run dear trialghost. Genereal stuff first: Make sure you only have a max of 100m per DP2/DP3 Segment of the Diag repeaterirrespective of the choosen baudrate (this is the max "monitoriable"/useful Segment lenght for a Diag repeater as you probably know already, if not seechapter 3.1.4 of the manual). If it is 1.5 Mbps: Fig 1 is "wasteful" in this case. You can start of from the CPU with up to 200meters (max. Segment lenght for 1.5 Mbps) before you connect to the DP1 port of the first repeater. This way you save yourself one Diag repeater (assuming you live without the ability to detect the distance of a cable break on this first segment). If it is >=3 Mbps: Both solutions will work equally well in my humble opinion (100meters is max permissible segment lenght now, irrespective if Diag or normal repeaters are used). I'd probably go for Fig 2 though, just because it seems logical to have at least some devices on a Diag repeater segment (and presumingthat you will have a bunch of more Slavesdownstream of the 2nd Diag repeater). Having said that, my advise is to stick with baudrates of <=1.5Mbps unless you have a jolly good reason to go faster. If you want to (have to) go"faster"I advise you to pay heed to chapter 3 of this manual(which is a good reference document to have in genereal): SIMATIC NET PROFIBUS Network Manual System Manual I hope this helps |
Last edited by: fritz at: 8/15/2009 2:26 AMCheers |
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