The function TF3680 TwinCAT?3 Filter provides various function blocks for implementing digital filters. Digital filters are used to manipulate digitized signals. They can be used, for example, to boost or to repress certain signal components in the frequency range. The library comprises function blocks for realizing filters with Butterworth or Chebyshev characteristics as well as function blocks for general use with freely definable filter coefficients. Furthermore, the library includes delay elements of different orders and a moving average filter.