How to assign TAG to I/O Field using script (C or VBS)?

In C script we can set output value (not assign tag) to I/O Field:

SetOutputValueDouble(lpszPictureName,"IOField1",0.0); or SetOutputValueDouble(lpszPictureName,"IOField1",GetTagDouble("someTag"));

or in VB:

Dim iofield
Set iofield= ScreenItems("IOField1")
iofield.OutputValue 1.0

or

iofield.OutputValue HMIRuntime.Tags("someTag_L171").read

But it just sets value (not tag) of a tag once time, and if tag changes its value iofiled won't change anything, until this script will be called again

So how to assign a tag using script? Is it possible? So I could see and also change value of a tag in I/O field

I need it because IOFiled can be changed to diffferent tags during RT (e.g. I use listbox of parameters & when I select some parameter, iofield shows tag's value (of that parameter) and should allow to change it)

I also understand that using this way (if it's possible) as well requeries to set "update cycle" in some way in script

if there was a function for iofields something like this SetOutputTag(Tag tag, Cycle cycle)..

bg2492

Hello anonym53,

in the C-Editor of WinCC you can find internal functions like
"SetLink" and "GetLink".

"SetLink" is creating a tag connection of object properties.
"SetLink" specifies the current tag connection of object properties.

The functions (with examples) in the WinCC-help.


Regards

Georg Berghof

 

 Thanks, I'll take a look at them

 bg2492

in the C-Editor of WinCC you can find internal functions like
"SetLink" and "GetLink".
 

Thank you again, works great

LINKINFO linkinfo;
linkinfo.LinkType = 1;
linkinfo.dwCycle = 0;
strcpy(linkinfo.szLinkName, "someTag");
SetLink(lpszPictureName,"iofield1","OutputValue",&linkinfo);

New question published by Mattleo is split to a separate thread with the subject How to assign TAG to I/O Field using VBS script?.

Best regards
Jen_Moderator