derivate

 Function Block 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 Motor systems having a reciprocating or oscillating motor that operates synchronously with the periodicity of the source which supplies the electrical energy. The period of execution of a pipe is the time spent between two successive computations of set values for the same pipe. The period of execution of a pipe is specified by the PERIOD parameter of the input pipe block.. 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 Example

FFLD Language Example

• 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.

IL Language Example

(* MyDerv is a declared instance of DERIVATE function A function calculates a result according to the current value of its inputs. 
A function has no internal data and is not linked to declared instances. block *)
Op1: CAL MyDerv (RUN, XIN, CYCLE)
FFLD  MyDerv.XOUT
ST Structured text - A high-level language that is block structured and syntactically resembles Pascal.  XOUT

ST Language Example

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

See Also

• average / averageL
• hyster
• integral
• lim_alrm
• stackint