DERIVATIVE

This function block ( The library UTIL.Library\ \) approximately determines the local derivation.

The function value is delivered as a REAL variable by using IN.

TM contains the time which has passed in msec in a DWORD.

By an input TRUE of RESET the function block can be restarted.

The output OUT is of the type REAL.

In order to obtain the best possible result, DERIVATIVE approximates using the last four values, in order to hold errors which are produced by inaccuracies in the input parameters as low as possible.

Example - Block in FBD\ \ \ \

DERIVATIVE in FBD

Output of DERIVATIVE