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Trend Display problem in WinCC

Created by: Pravin007 at: 1/23/2006 8:28 AM (7 Replies)

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1/23/2006 8:28 AM	Rate (0)
Pravin007 Posts: 15 Rating: (0)	Hello, I have one problem regarding the trend display in WinCC. When I switch OFF and ON the Power of PLC then the trend windoware not displayed preveous trends for approx. 2/3 days but in Ruler table it shows the valuefor that instances. If I select the display range for 7 days then it display the trends but if I select display range for 3 days, 2 days, or for lowerer ranges the same trends are not displyed. Here two sample screens are shown. Please concentrate on the the area covered ingreen circle. My Questions: 1. What is a reason behind this? 2. What is the solution to disply the trends continuously for any ranges? 3. If my PLC is OFF for some time and WinCC is Running for that time thenWhat trend disply shows? Please do the needful. Thanks Pravin Attachment Trend_1.gif (867 Downloads)
Pravin007 Posts: 15 Rating: (0)	Last edited by: Pravin007 at: 1/23/2006 9:54 AM
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1/24/2006 10:43 AM	Rate (1)
Salma Gold Member Joined: 9/27/2005 Last visit: 11/27/2007 Posts: 1398 Rating: (151)	Hello The letter "u" placed after the value in the ruler indicates that the value reported has a status of uncertain. This occurs when the tag quality is bad which will happen if the PLC is switched off. WinCC will interpolate the values on a trend. So it will draw a straight line between the two last known values. That is what you are seeing on your trend. This is how WinCC is designed. The only way to ensure that data is displayed correctly on a trend is to ensure that WinCC does not lose communications to the PLC. Please accept my apologies if I have misunderstood your question. Regards, Salma

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1/27/2006 12:56 PM	Rate (0)
Pravin007 Posts: 15 Rating: (0)	Hello Salma, Thanks for reply. If my PLC is OFF for 1 min. then I should loss the data only for that one minuite But in my case data losses for approx 2/3 days. Please go through the two trends attached herewith. Please do the needful. Regards Pravin. Attachment Trends.zip (731 Downloads)
Pravin007 Posts: 15 Rating: (0)
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1/27/2006 1:59 PM	Rate (0)
Salma Gold Member Joined: 9/27/2005 Last visit: 11/27/2007 Posts: 1398 Rating: (151)	Hello Pravin Can you tell us how the archive tag JAR1\PV_TEMP_JAR1 has been configured in the Tag Logging system. Are you using Cyclic-continuous or Upon Change acquisition type? What is the acquisition rate set to? What is the archiving/display rate set to? Also what version of WinCC are you using (including service packs and hotfixes)? Regards, Salma
	Last edited by: salma at: 1/27/2006 2:00 PM
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1/29/2006 7:01 AM	Rate (0)
Pravin007 Posts: 15 Rating: (0)	Hello Salma, Here are the settings for archive tag JAR1\PV_TEMP_JAR1. Acquisition type :- Cyclic-continuous. Acquisition rate :- 1 second. Archiving/Disploay :- 60 * 1 second. I am Using WinCC V6.0 SP1. Regards, Pravin
Pravin007 Posts: 15 Rating: (0)
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1/30/2006 8:26 AM	Rate (0)
Nemo Posts: 3149 Rating: (171)	Hello Pravin007, could please attach your WinCC-diagnosefiles in the forum as well? (..\WinCC\diagnose\..) regards, Nemo
Nemo Posts: 3149 Rating: (171)
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1/30/2006 10:10 AM	Rate (0)
Salma Gold Member Joined: 9/27/2005 Last visit: 11/27/2007 Posts: 1398 Rating: (151)	On a side note, why are you acquiring the value every second but logging it every minute? I assume you aren't logging the actual tag value but instead an aggregate such as the sum, min, max or average. Or do you have a script to calculate the logged value?

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2/11/2024 2:12 PM	Rate (0)
rannieryc Member Joined: 1/18/2018 Last visit: 2/15/2024 Posts: 1 Rating: (0)	Good morning, the trends in WinCC PCS7 appeared with more pronounced lines, and the values were not plotted on the chart. However, when hovering over the lines, the values were displayed. I'll be attaching an image of the issue. Please note that this occurred on 2 different machines with different applications Reinforcing, this issue occurred in two different applications on the same day. One is standalone, and the other has a client-server setup Attachment Imagem do WhatsApp de 2024-02-11 à(s) 02.59.04_9253b142.jpg (197 Downloads)

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