Resetting The Potentiometer Value To Zero On Screen Button Push

[tomtar]

Hi,

 

I am entirely new to scrpting and DaqFactory hence my questions are very simple comparing with other subjects discussed on the forum:

 

1. What i am trying to do:
   I need to create a button with possibly quick sequence that will reset the potentiometer position reading to zero so partial piston stroke is shown.
    
2. I have a linear potentiometer that already displays the position of piston through a simple conversion.
    
3. I have an absolut readout from potentiometer shown on the graph already.

Thanks for any help on this.

 

Tom

[AzeoTech]

What you'll want to do is create a global variable to store that zero position.  So, create a sequence marked Auto-Start and put something like this:

 

global zeroPoint = 0

 

Then in the Quick Sequence for your button, and assuming the channel reading the potentiometer is simply called "pot", put:

 

zeroPoint = pot[0]

 

Then, whenever you want to display the adjust value, do the subtraction, so in a variable value it might be:

 

pot[0] - zeroPoint

 

and in a graph:

 

pot - zeroPoint