SIMATIC WinCC

Read tag prefix and/or set tag prefix

Thread Starter: GermanDan   Started: 7/18/2012 11:07 PM   Replies: 2

  7/18/2012, 11:07 PM

GermanDan Joined 5/17/2012 Last visit: 7/24/2012 Posts: 8 Rating:  (0)

(0)  Hi community, I'm working on a project using WinCC v7+SP2. I have one function that is usually called from a picture that has a Tag Prefix. But once in a while I want to call this function from an action. What I intended to do is to "ask" if there is a prefix defined and if not define it myself. Since the Get and Set functions have the prefix information as well I figured that information is probably somewhere. But I couldn't find it so far :( Is there a tag that contains the prefix? Or is there a function to read and define the prefix? How would you solve this problem? Thanks! Daniel.

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  7/19/2012, 10:00 AM

Bizur Joined 10/5/2010 Last visit: 5/17/2013 Posts: 1349 Rating:  (34)	(0)  Hello GermanDan, please take a look at this. https://www.automation.siemens.com/WW/forum/guests/PostShow.aspx?HTTPS=REDIR&PostID=319467&language=en Best regards Bizur
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  7/19/2012, 2:14 PM

GermanDan Joined 5/17/2012 Last visit: 7/24/2012 Posts: 8 Rating:  (0)

(0)  Good morning, thank you for your answer. the thread you posted explains how to use the tag prefix in c-scripts if they are called from a picture that has a prefix defined. My problem is slightly different: I was wondering if there is a possibility to define a tag prefix manually if this c-script is called by a global action and not from that picture. In my case I want to write a config file everytime there's a certain change in a picture. Since I defined a tag prefix for this picture I omitted the prefixes in the c-function that is called. But once in a while there is another event that triggers a global action that should use the same c-function to write the config file. That doesn't work though because all the prefixes are missing. So I was hoping that there is a way to ask if there's a prefix defined and if not to define it yourself. Kind of like this: if (prefix == NULL) { prefix = "selfdefinedPrefix"; } Thanks, Dan.

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