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Problem with WinCC C-Script running slow but only first time

Created by: jayr at: 5/12/2008 3:56 PM (12 Replies)

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5/20/2008 7:47 AM	Rate (0)
Darius Platinum Member Joined: 9/28/2005 Last visit: 12/10/2024 Posts: 2957 Rating: (243)	Hi, Thats very clear post. Thanks. Can you tell me how to implement this if you want to runscript cyclically for every tag: RonaldNijssen 1. declare them in the script and use them as a trigger What do you mean about that? How to implement this. All your other suggestions was clear. Thanks again. Regards,
	Best regards, Darius
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5/20/2008 3:09 PM	Rate (0)
jayr Member Joined: 5/12/2008 Last visit: 4/26/2023 Posts: 7 Rating: (0)	I can explain whatI did after getting his post.All of thetags that I need to read later are shown on about 5 diffferent pdls. So I wrote a script that runs when WinCC first starts that cycles through these pdls. It only takes a few seconds and then when the problem script runs now it is less than a second versus 4-5 minutes! Jay

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5/21/2008 7:41 AM	Rate (0)
Yolov Bronze Member Joined: 2/22/2006 Last visit: 1/24/2025 Posts: 291 Rating: (37)	Hi, RonaldNijssen gave very detailed explanation regarding this issue! I would give you another idea solving the issue. Try using: BOOL GetTagMultiStateWait(DWORD* pdwState, const char* pFormat) The values and states of several tags are established and stored in the corresponding addresses in the specified format. The values are read explicitly from the AS. Please check WinCC Information System for details of using. It allows you to retrive the tag's values in one optimized request. It is very effective in slow connections. In one of my project I have the same problem as you. Each tag request takes about 2 s. With GetTagMultiStateWait I read 48 tags in 2 s. The only disadvantage is that it is WAIT function and always get the tags from the PLC. In the other way you will have the very recent data from the PLC. Bestr regards, Svetozar Yolov

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