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How to store the Standard Deviation of an analog process tag in archive

Created by: nicolas 93410 at: 5/13/2008 6:39 PM (3 Replies)

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5/13/2008 6:39 PM	Rate (0)
nicolas 93410 Posts: 2 Rating: (0)	Hi, As mentionned in the ID "24050680 : How is the mean value for process variables stored in the process value archive?", I would like to store the StdDev value and not the mean. But unfortunately it doesn't seem to be a standard option. How should I do ? Do I need a script to calculate it ? Does this script already exist ? Thanks in advance for your help. Nicolas WinCC V6.2
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5/14/2008 8:29 AM	Rate (0)
April Posts: 1776 Rating: (95)	Hi, there is no basic function for Standard Deviation. Also i Don´t have a script. But if you do it post it here.
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5/14/2008 11:07 AM	Rate (0)
nicolas 93410 Posts: 2 Rating: (0)	I expected another answer... because I am not ready to do it, too complex for me. Do you think that the new option "Process Monitor" has got some solution for that ? Nicolas
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5/19/2008 1:03 PM	Rate (0)
April Posts: 1776 Rating: (95)	Hi, yes ProcessMonitor will do this. See the Link http://support.automation.siemens.com/WW/view/en/26679792 chapter 1.2 Predefined calculation
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