DERIVATEPLCopen motion icon

Function BlockClosedA 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.

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.

Inputs

RUN : BOOL    Run command: TRUE=derivate / FALSE=hold
XIN : REAL    Input signal
CYCLE : TIME  Sampling period (must not be less than the target cycle timing)

Outputs

XOUT : REAL   Output signal

Remarks

In FFLD language, the input rung is the RUN command. The output rung keeps the state of the input rung.

ST Language

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

FBD Language

DerivateFbd.gif (1512 octets)

FFLD Language

(* 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

See also

AVERAGE   INTEGRAL   LIM_ALRM   HYSTERSTACKINT