Change the value upper limit, etc directly from HMI

CODESYS
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1

Hi all,
what should I do so that the user can change the value of the limit of the sensor directly from the HMI? Means no need to change at the back-end of the programming.

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Best regards,
Umair

2

Hi Umair,

In CODESYS Trend Recorder, you can set min and max limits for multiple Y-Axis. In this case, I have used a Global Variable to set the y-axis maximum for temperature. (Also consider using a Persistent Variable, if you would like this to be retained on a power cycle)

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You could then assign and Input Configuration to edit this variable from the HMI. In this case I have used “Write Variable”, and allow the user to edit this value with limits between 0…100.

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One more useful feature, is to use the pre-built element for trend controlling. If you write click on the trend, you can add elements that will change the timescale, hide variables, and enable zooming or panning.

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Hope this helps!

1 Like
3

Hi Mike,

how do I add this Trend Recorder? Is it not something from the Visualization Toolbox? Currently I am using Trace as shown in the Visualization Toolbox below. Or perhaps you can share a video link which doing the same thing as this that you know.

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Best regards,
Umair

4

Hi,

I added a Trend Recording Manager under the PLC Application. I am not certain of the differences between Trends and Traces if anyone has input.

Thank you,

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5

Hi,

ok great. Will try!

6

Trace will start form when you show the page and will only be relative time.
Trend will always record to the file system the data (with a limit and ring buffer type).

For data monitoring a trend is maybe a better solution if you need to look at what happened when the visu wasn’t actively viewed.

1 Like