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Capture the change of a variable

1/9/2025 2:01 AM	Rate (0)
NIUPIICOHECHA10 Joined: 5/15/2023 Last visit: 9/10/2025 Posts: 23 Rating: (0)	I need to capture the change of a variable, this capture can contain date and time, the user who made the change and the value before the change and the current one and display it either in the alarmlogging or a txt, csv or mdf file. I appreciate your help

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1/9/2025 9:35 AM	Rate (0)
itafusna Silver Expert Joined: 2/17/2020 Last visit: 9/11/2025 Posts: 1251 Rating: (237)	Hi, This can be done with the WinCC/Audit option. Please see: How do you configure the auditing of GMP tags in WinCC Audit V7.5 SP1?
	A rating will be well appreciated.
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This contribution was helpful to 1 thankful Users Murof

1/9/2025 11:18 AM	Rate (0)
Murof Platinum Expert Joined: 8/3/2009 Last visit: 9/12/2025 Posts: 16409 Rating: (1935)	Hello NIUPIICOHECHA10 you can use the WinCC Option Audit for this usecase. If you want to capture the change only in an IO field then you can also activate the "operator Message" property, then you get this information in alarm logging: Bye Murof
	If this Information really helps, you could use the Rate function
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