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Trend Configuration
Create
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3 INT (INT16)
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tags named Count, Max, and Min. Count will have an Initial Value of 0, Max will have an Initial Value of 20. Min will have an Initial Value of 0. Lastly, create one BOOL tag named ON. The Initial Value should be false.
2. Create a Lamp on the page. To create a Switch/Lamp,
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go to Insert > Switch/Lamp or
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left-click the Switch/Lamp icon in the Toolbar. Then click-and-drag on the
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screen to place the lamp. Once the Switch/Lamp is created, drag the ON tag to the Lamp. This will bind Value to the Tag ON.
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Click on Tools > Script Editor. Click the + icon to create a new script, then copy and paste the following code in the new script:
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var invert = false; // Decides if the value should increase or decrease thread.msleep(1000); // Waits for Lamp tag to update while (tag.read("ON")) { // While Lamp tag is On (1) tag.write("Count", invert ? tag.read("Count") - 1 : tag.read("Count") + 1); // If Invert is false, |
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Add 1 to Count tag, if invert is true, Subtract 1 from Count tag
thread.msleep(1000); // waits for Count tag to update
if (tag.read("Count") == tag.read("Min") || tag.read("Count") == tag.read("Max")) { // Check if Count tag has reached max or min of Trend
invert = !invert; // inverses the invert var
}
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Once pasted in, close the Script Editor. Select the Lamp, and go to the Actions tab. If Actions does not display, go to View > Properties > Actions to make it display. Under On Press, click the Action Field and Create New Command. Click on Add New Command and select Toggle Tag Value. Under Parameters, select the ON tag. Then, in the top left of the Command Editor, click the + icon, and for the new command, select Call Script and select the script that was created.
Create the Trend by going to Insert > Trend or by simply clicking Trend on the Hotbar. In the Basic Properties of the Trend,
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drag the Max tag to Max Value and the Min tag to Min Value to
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bind them to the properties.
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Click and hold the Count tag and drag it over the Trend. This will create a new Pen in the Basic Properties of the Trend. Go to Pen 1, and change the Pen Width to 5.
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Trend Runtime
Click Tools >Launch Simulator to launch the Canvas Simulator.
Click the Lamp to Toggle it On.
After letting it run for a while, change the Max tag to 10 and the Min tag to -10. Make sure the Count is not outside the range before changing. If Count goes out of bounds, edit the Max or Min depending on if its being added or subtracted so that it will be caught within bounds.
