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Displaying a Plot with a Function Trend Control in WinCC

You're encountering a common issue when trying to overlay a custom plot (like a simple line) with a WinCC Function Trend Control. Unfortunately, WinCC's Function Trend Control is designed to be 'on top' and doesn't natively allow being sent to the background.

Here are a few potential workarounds:

• Consider using a Picture Element: Instead of a Function Trend Control, use a picture element to draw both the Function Trend Control and your line plot. This gives you full control over layering. You might need to use scripting to update the line plot within the picture element.
• Transparency Limitations: As you've discovered, changing the Function Trend Control’s background transparency doesn’t solve the layering problem.
• Explore alternative visualization options: If the function trend control's specific features aren't critical, consider using a standard I/O field or a different graphical object to display the data alongside your custom plot.

For further information related to plotting on WinCC, please refer to these resources:

• Plot XY Value on WinCC Function Trend Control
• How to display a dynamic trend in WinCC (TIA Portal)