PID feedback of the heating element regulation

I developed a .VI which controls the temperature of up to 8 items from a device, I built successfully but the solution feels dirty and I'm looking for feedback.

Hardware I use

  • USB data acquisition board - TC for temperature input and relay control (using the digital output). - Link
  • Thermocouples type K
  • Crydom solid relay switch. - Link
  • Heater cartridge 120V

I have included an an example of a single entry .VI.  I start by configuring bit exit USB - TCs so I can control the CRDD.  Then, once all ten loops I taste a DAQ card for a weather channel.  I'm doing this because I use a second DAQ card for no temperature measurements and see common cards right now.  The temperature of the sampled goes to the the .vi PID process variable.  The output of the PID .vi range from 0 to 100% because I want a duty cycle output.   This is where it gets really "disorder."  I use the PID output to generate a waveform, and then convert a digital waveform and then to convert the digital signals in an array of Boolean.  I found the [1,1] index of that table works and I lets put the digital output channel either up or down.  I have this output connected to the Republic socialist Soviet, high once allowing current flow to the cartridge heater.

I feel like there's a cleaner way to do it.

Thanks for all the inputs.

Hunter

Sorry, I didn't watch it with enough attention your time VI the first by in order to understand what you were doing.  It's the kind of simplification you're looking for?  If you don't want to follow both entry yourself, you can use the similar "Wave.vi Square" (instead of the version of Point by Point, I've used here).

Tags: NI Software

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