Lenze PLC Designer PLC Designer (R2-x) Instrukcja Użytkownika Pobierz pdf (Strona 664)

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L-force | PLC Designer

PLC Designer Libraries

662 DMS 3.2 EN 02/2011 TD29 

19.2.3 Mathematic Auxiliary Functions

DERIVATIVE

Provided by util.lib.

This function block 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 and the input of RESET of the type BOOL allows

the function block to start anew through the delivery of the value TRUE.

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.

Block in FBD:

INTEGRAL

Provided by util.lib.

This function block approximately determines the integral of the function.

In an analogue fashion to DERIVATIVE, the function value is delivered as a REAL

variable by using IN. TM contains the time which has passed in msec in a DWORD and

the input of RESET of the type BOOL allows the function block to start anew with the

value TRUE.

The output OUT is of the type REAL.

The integral is approximated by two step functions. The average of these is delivered

as the approximated integral.

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