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How to change tag of an object at run time ?

Created by: zeroptr at: 8/13/2010 11:00 AM (5 Replies)

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8/13/2010 11:00 AM	Rate (0)
zeroptr Posts: 31 Rating: (0)	Hi All, I have 28 loadcell at my project and I don't want to create 28 separated calibration pages for every loadcell. So I put a symbolic IO field and fill it with the names of my loadcells. When the value changes, I want to show my operator the selectted loadcells calibration values. So I have to change the tags of my fields. I try to write a script like this.. Dim Silo,Kapasite,Kesme,MinAnalog,MinKG,KalibAnalog,KalibKG Set Silo = HmiRuntime.Screens("Kalibrasyon").ScreenItems("cboSilo") Set Kapasite = HmiRuntime.Screens("Kalibrasyon").ScreenItems("txtKapasite") Select Case Silo.value Case 0 Kapasite.ProcessTag = "LOADCALIB.A1_CAPACITY" Case 1 Kapasite.ProcessTag = "LOADCALIB.A2_CAPACITY" End Select but the compiler doesnt like the underlined words. Has anyone knows any solition for this kind of problem... Or any idea to solve this requirement.. Any sample will be very helpfull... Thanks..
zeroptr Posts: 31 Rating: (0)	Last edited by: zeroptr at: 8/13/2010 11:09 AM
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8/13/2010 12:41 PM	Rate (0)
Darius Platinum Member Joined: 9/28/2005 Last visit: 12/9/2025 Posts: 2957 Rating: (243)	Hello, You get compiler error because there properties are not available in script scope. I would choose another approach in your situation. You can use one tag per I/O field and make assigment to another tag in PLC. For example Symbolic IO field's tag value changes and on that event in the PLC you assign your connected tag to another tag which you need. You can use indirect addressing in that case in PLC. So the idea is to make everything you need in the PLC and use only one tag in HMI.
	Best regards, Darius
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8/13/2010 2:27 PM	Rate (0)
skimmer Posts: 317 Rating: (18)	Hi, I think it would be better to have a standard screen with the tags of your load cell and use a multiplex tax in WinCC Flex to display the values of each cell as required. This faq shows how to use multiplex tags. http://support.automation.siemens.com/WW/view/en/21808320
skimmer Posts: 317 Rating: (18)
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8/13/2010 3:46 PM	Rate (0)
Ben Rad Bronze Member Joined: 7/28/2010 Last visit: 8/31/2024 Posts: 184 Rating: (11)	Zeroptr, You have 28 Load Cells. 1.You better have 28 DBs (one for each load cell) which keep the scale values and analog values. This way you will have a clean code and know where to look for data related to each one. 2. Let's say DB1 is for Load Cell 1. "DB1.DBD0" has the output weight. 2. You need an index. Let's call it "Analog _Index". 3.You are saving the "Analog_Index" in "DB100.DBW0". 4. You setup atag in Wincc Flex. Analog_Index Word DB100.DBW0 4. You setup another tag for displaying the AnalogValues on the screen. Analog_Display Real DB [Analog_Index] DBD0 5.By changing the "Analog_Index" through HMI, you can display the output. Regards, Behnam www.sigmaprocess.ca/blog

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8/15/2010 5:50 PM	Rate (0)
zeroptr Posts: 31 Rating: (0)	Hi All, I solved the problem with Darius way.. (He was the first answerer) I like the multiplexing the tag it's very nice.. I plan to use it at my further projects.. [schnippschnapp] New question is transferred to Does any one know the tag limit of MP277 10" Key?.
zeroptr Posts: 31 Rating: (0)	Last edited by: O_Moderator at: 8/16/2010 8:49 AM
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8/17/2010 7:57 AM	Rate (0)
Darius Platinum Member Joined: 9/28/2005 Last visit: 12/9/2025 Posts: 2957 Rating: (243)	Hello, I try to use as less as possible scripts, multiplexing, animation and so on on HMI. It just runs faster and it will be more reliable. But this is just my thoughts .
	Best regards, Darius
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