derivate

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 Function BlockClosed A function block groups an algorithm and a set of private data. It has inputs and outputs. - Computes the derivative of a signal with respect to time.

Inputs

Input

Data Type

Range

Unit

Default

Description

RUN

BOOL

TRUE, FALSE

 

 

Run command:

  • TRUE=derivate.
  • FALSE=hold.

XIN

REAL

 

 

 

Input signal.

CYCLE

TIME

 

 

 

Sampling period.

Must not be less than the target cycle timing.

Outputs

Output

Data Type

Range

Unit

Description

XOUT

REAL

 

 

Output signal.

Remarks

  • The time unit is seconds.
  • The output signal has the units of the input signal divided by seconds.
  • The derivate block samples the input signal at a maximum rate of 1 millisecond.

FBD Language

DerivateFbd.gif (1512 octets)

FFLD Language

  • In the FFLD language, the input rung is the RUN command.
    • The output rung keeps the state of the input rung.
    • ENO has the same state as RUN.

DerivateLd.gif (1598 octets)

IL Language 

(* MyDerv is a declared instance of DERIVATE function block *)
Op1: CAL MyDerv (RUN, XIN, CYCLE)
FFLD  MyDerv.XOUT
STClosed "Structured text"
A high-level language that is block structured and syntactically resembles Pascal  XOUT

ST Language 

(* MyDerv is a declared instance of DERIVATE function block. *)
MyDerv (RUN, XIN, CYCLE);
XOUT := MyDerv.XOUT;

See Also