PLC Archive:Derivative Calculation

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Derivative Calculation

contributed by: Simone Stefani

Link to File

Click here to view program file.

Abstract

This function calculates the 1st derivative of [Input_value]. The derivative is calculated on 20 samples of [Input_value] - the samples are taken each time [CLK] is TRUE. The output value is the sum of the 1st 10 samples with 2nd 10 samples.

Parameters:

  • [Input_value]: Value to derive
  • [Reset]: This command resets the act derive value. The calculation restarts when all the items of samples array are refreshed.
  • [Derive_spl_CMD]: Timing step. The samples are taken when [Derive_spl_CMD] = TRUE
  • [Derive_value]: Derivated output value
  • [Enable]: This output is energized when the calculation of act value is finished
  • [Samples]: Samples container.
  • [Nr_samples]: # of samples to take for calculation
  • [Derive_calc_ON]: System variable
  • [Nr_of_shf]: System variable
  • [Loop]: System variable
  • [Index]: System variable
  • [Prev_sum]: System variable
  • [Next_sum]: System variable
  • [Dummy_bit_1]: System variable
  • [Calc_ON]: System variable
  • [Init_end]: System variable

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