DIF_ – Difference

Block SymbolLicensing group: STANDARD

Function Description
The DIF_ block differentiates the input signal u according to the following formula

y k = u k - u k - 1, <math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><mrow><msub><mrow> <mstyle class="mbox"><mtext class="texttt" mathvariant="monospace">y</mtext></mstyle></mrow><mrow><mi>k</mi></mrow></msub> <mo class="MathClass-rel">=</mo><msub><mrow> <mstyle class="mbox"><mtext class="texttt" mathvariant="monospace">u</mtext></mstyle></mrow><mrow><mi>k</mi></mrow></msub> <mo class="MathClass-bin">-</mo><msub><mrow><mstyle class="mbox"><mtext class="texttt" mathvariant="monospace">u</mtext></mstyle></mrow><mrow><mi>k</mi><mo class="MathClass-bin">-</mo><mn>1</mn></mrow></msub><mo class="MathClass-punc">,</mo> </mrow></math>

where $u_{k} = u$ , $y_{k} = y$ and $u_{k - 1}$ is the value of input u in the previous cycle (delay $T_{S}$ , which is the execution period of the block).

Input

u	Analog input of the block	Double (F64)

Output

y	Difference of the input signal	Double (F64)

Parameters

ISSF

Zero output at start-up

Bool

off ..: In the first cycle the output will be $y = u$ .
on ...: Zero output in the first cycle, $y = 0$ .

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