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Cannot fprintf read in "%" from WinCC tags

Created by: unipirate at: 9/9/2009 4:20 AM (6 Replies)

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9/9/2009 4:20 AM	Rate (0)
unipirate Posts: 10 Rating: (0)	All I am using a unit of "%" for a process value within WinCC. This value is taken from the #unit property of the process value in the CFC. I have a script that reads about 77 different runtime process values and their corresponding units. The only problem I am having is that the script does not seem to display/read the unit "%". I am able to read "mbar", "bar", "psi", "psf", "°C", "°F", "rpm", "krpm" but not "%". I thought it may be that this unit is not in the 'Shared Declarations", but it was! All units are read in as follows, Unit = GetTagChar(tagname); //where Unit is a pointer and tagname is a char[] I have debugged the code and am certain that this tagname is correct. I don't get any errors in apdiag when this GetTagChar is called. Does Global Script C have some issue with reading in the character "%"? Does anyone know how to go about fixing this issue? Cheers
unipirate Posts: 10 Rating: (0)	Last edited by: unipirate at: 9/17/2009 8:53 AM Global Script can read in tag detail, "%", from WinCC tags but cannot fprint "%"
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9/9/2009 9:22 AM	Rate (0)
Tolleif Experienced Member Joined: 9/7/2005 Last visit: 8/22/2025 Posts: 31 Rating: (9)	Is the ¨%¨ presented correctly if you connect the unittag directly to an IOField? (no script)
	Siemens Oil&Gas Offshore Norway
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9/9/2009 9:35 AM	Rate (0)
unipirate Posts: 10 Rating: (0)	Yes the process vaule in the CFC is correctly taged with the unit on the function block parameter 'unit' for the input value. This process value and the unit are both displayed correctly on the WinCC RT graphic. Any ideas?
unipirate Posts: 10 Rating: (0)
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9/16/2009 4:23 AM	Rate (0)
unipirate Posts: 10 Rating: (0)	New developement. After discussing with my colleague we have found that Global Script does actually read in the unit "%". This was found by using the function strcmp. Then by adding the "\" to the beginning of this unit so the resulant char array is "\%" we are able to use the function printf and disply the correct unit. For some strange reason though using fprintf the character is not displayed once the file has been written. This has now confused me even more. Why does printf now work with this character and fprintf does not? Should these not function the same? Please some body!!!
unipirate Posts: 10 Rating: (0)
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9/17/2009 9:05 AM	Rate (0)
CBo Gold Member Joined: 4/5/2006 Last visit: 7/30/2025 Posts: 917 Rating: (63)	Hi unipirate , "%" charscter is a control char in some "C" cunction (like fprintf, sprintf ...), when you want use a "control char" into your code there are 2 solution: 1) you know, use other "\" char to say you don't use char as "control char" but you want to use as "simple" char 2) use double char like "%%" for example, but this has to use for special function, like serial comunication end so on. Hope can clarify a bit your confusion Regards

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9/17/2009 10:44 AM	Rate (0)
ranr_mids Bronze Member Joined: 12/5/2005 Last visit: 8/9/2021 Posts: 289 Rating: (19)	This may sound like a 'low-tech' solution, but is it possible to replace the '%' symbol with ^o/o ? (superscript and/or subscript characters)

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9/18/2009 12:57 AM	Rate (0)
unipirate Posts: 10 Rating: (0)	Well I knew there was a solution out there just didn't expect it to be what worked! CBo yes "%" is a very special character. I knew the problem had something to do with the substituion in printf, sprintf and so on. The only thing I don't understand is why "\" didn't work throughout all the print functions. The "\" character seems to work in all other cases where required. So the solution that worked for me to print the character "%" to my CSV file was to, as CBo pointed out, add another "%"; which gave "%%". Luckily i am not doing any serial communications in ths script and will never either so I don't think i need to worry about that issue yet! Thanks CBo and others who added their knowledge.
unipirate Posts: 10 Rating: (0)
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