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Simple Sample and TIPs - WinCC Unified - Buffer Trends

Created by: Denilson Pegaia at: 5/23/2025 10:20 AM (0 Replies)

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5/23/2025 10:20 AM	Rate (0)
Denilson Pegaia Diamond Expert Joined: 9/23/2005 Last visit: 1/19/2026 Posts: 4449 Rating: (1487)	Hi As from WinCC Unified V20 up3 it is possible to show the values are buffered in the PLC (Array of variables) as a whole in a trend control configuration steps: The data should be placed as a Array variable in the PLC (e.g. a array of reals in a DB). Create a variable that represents the array as BlockArray. (for example, drag and drop the array from the PLC to the HMI’s tag table, change the HMI data type to BlockArray and the acquisition mode to On demand) Place the trend object on the screen Drag and drop the HMI’s BlockArray tag to the trend object Match the time axis property: General > Trend areas > [0] Trend area > Time axis -bottom > [0] Time axis > Time range = index Match the number of points to be represented: General > Trend areas > [0] Trend area > Time axis -bottom > [0] Time axis > measuring points Place a button (or any other way to run a script to update the trend control object) with the following code (where HMIDtat_BlockTrendBufferTransfer represents the HMI’s BlockArray tag): Let blockData = Tags(“HMIDtat_BlockTrendBufferTransfer”) .Read(HMIRuntime.Tags.Enums.hmiReadType.hmiReadDirect) TIPs: At the first-time that the screen is loaded, the data are uploaded automatically on the trend control. You can find an online documentation at https://docs.tia.siemens.cloud/r/en-us/v1.0/wincc-unified-modernization/modernization-how-tos/screens-and-screenobjects/bit-triggered-trends-with-buffered-acquisition Sample Project (user = User, password = Password1!) Attachment Project6_20250523_0612.zip (179 Downloads)
	Denilson Pegaia Siemens Industry Sector Technical Support
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