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NaN stands for "Not a Number" and is often a sign, that something went wrong. It can have multiple causes, for example:

  • A control / indicator element has no variable assigned
  • A measurement from a hardware has failed and NaN has been set as the substitute value
  • NaN was manually assigned
  • A variable was not yet written to - all variables have a default value of NaN at startup.
  • A calculated formula contains an error or an invalid operation like a division by zero