TechTip: Weintek HMI Data Sampling

We’re often being asked “How do I data sample with a Weintek HMI?”, so below is a simple step-by-step example along with a sample project that you can run on the EasyBuilder Pro simulator to test. In our example program, we are sampling 3 LW registers (LW are Weintek HMI Local Words) starting from LW0 through to LW2. Step 1 Click on “Data Sampling” in the Data/History Tab in EasyBuilder Pro: Step 2 Click “New” to set up a new Data Sampling Object: Step 3 You can name your Data Sampling Object using the “Comment” field. For this example, we are using Time-based sampling, every second. For many applications, Trigger-Based is appropriate where an action such as a PLC bit being set, or an HMI button being pressed records the data at that moment. The read address is the start address for our Data Sampling – we are using LW0 as our start address. Step 4 Click “Data Format”. Step 5 Click “New…” Choose the Data type. In our example, we are using LW registers as 16-bit Unsigned. Click “OK”. Step 6 Repeat this 3 times (remember, we are sampling 3 addresses – LW0-LW2). Click “Exit” The Data Sampling Object list should now have the Data Sampling Object created on it. Click “Exit”. Step 7 On the Data Sampling Object Window, we should see the Data length as “3 Word(s)”. Step 8 To place a trend graph on the screen, click on “Trend Display” under the Data/History tab. Select the Data Sampling Object to use. If there is more than one, they will be available on the drop-down list. For this example, we are using Time to scale the X axis: In the “Channel” tab, we can select which data samples are displayed and set the scale (min-max), assign a pen colour and width, In the example program, the value of the LW registers is 0-100, so our minimum is 0 and our maximum is 100. Example Program An example project is available to download here. You will need at least version 6.01.02.123 to open this file.

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