DERIVATE

Differentiation of a real value over a defined cycle time.
Operation details:
  • If the CYCLE parameter value is less than the cycle timing of the execution of the device, the sampling period is forced to this cycle timing.
  • The derivation is performed with a time base of milliseconds. For example, the derivation of an input of 1000 that changes to 2000 over a time period of 1 second results in a value of 1. To convert the output of the instruction to units of seconds, multiply the output by 1000.
Languages supported: Function block diagram, ladder diagram, structured text.
This instruction applies to the Micro810, L20E, L50E, and L70E controllers.
DERIVATE
DERIVATE
DERIVATE parameters
Parameter
Parameter Type
Data Type
Description
RUN
Input
BOOL
Indicates the operational mode of the instruction.
  • TRUE: Normal (perform calculation)
  • FALSE: Reset
XIN
Input
REAL
Defines the value on which to perform the derivation calculation. The value must be a REAL value.
CYCLE
Input
TIME
Defines the sampling time period over which to collect values. Possible time period values range from 0ms through 49d17h2m47s294ms.
XOUT
Output
REAL
Differentiated output.
ENO
Output
BOOL
Enable output.
Applies only to ladder diagram programs.

DERIVATE examples

DERIVATE function block diagram example
DERIVATE function block diagram example
DERIVATE ladder diagram example
DERIVATE ladder diagram example
DERIVATE structured text example
DERIVATE structured text example
(* ST Equivalence: DERIVATE1 is an instance of a DERIVATE block *)

DERIVATE1(manual_mode, sensor_value, t#100ms);

derivated_value := DERIVATE1.XOUT;
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