Using conditional conversions


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After calibrating a displacement sensor it shows that the best results are obtained when splitting the range of the sensor in two parts (range A and range B).

In range A, conversion A is the best, in range B, conversion B gives the best results.

How can I use two different conversions, based on a button with which I select the range taht I use.

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Use simple boolean math and a flag.  So let's say you create a flag called "UseRangeB" that is either 0 for Range A, or 1 for Range B.  Use "global UseRangeB = 0" in an autostart sequence to do this.  Let's say Range A's conversion is "Value * 2" while Range B's conversion is "Value * 3".  The overall Conversion would then be:

(Value * 2) * !UseRangeB + (Value * 3) * UseRangeB

 

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The problem is that you can't have two channels that reference the same I/O point.  They are considered the same channel and whether the Conversion is applied is unpredictable because one has a Conversion and the other does not.

If you really want to have a raw and converted channel, then you need to create a regular raw channel for the I/O point, then create a Test D/A channel with Timing = 0, and then put code in the Event for the raw reading that stuffs the converted value into the test channel.  In this case, you can use iif instead of the boolean math.  iif() doesn't work inside a Conversion under the latest version of DAQFactory (something we need to fix...)

sensor_output_converted.addvalue(iif(button_state), sensor_output_raw[0] + 10, sensor_output_raw[0] + 50)

 

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