DEL – Delay with initialization

Block SymbolLicensing group: STANDARD

Function Description
The DEL block implements a delay of the input signal u. The signal is shifted n samples backwards, i.e.

y k = u k - n . <math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><mrow> <msub><mrow><mi>y</mi></mrow><mrow><mi>k</mi></mrow></msub> <mo class="MathClass-rel">=</mo> <msub><mrow><mi>u</mi></mrow><mrow><mi>k</mi><mo class="MathClass-bin">-</mo><mi>n</mi></mrow></msub><mo class="MathClass-punc">.</mo> </mrow></math>

If the last n samples are not yet known, the output is set to

y k = y 0, <math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><mrow> <msub><mrow><mi>y</mi></mrow><mrow><mi>k</mi></mrow></msub> <mo class="MathClass-rel">=</mo> <msub><mrow><mi>y</mi></mrow><mrow><mn>0</mn></mrow></msub><mo class="MathClass-punc">,</mo> </mrow></math>

where $y_{0}$ is the initialization input signal. This can happen after restarting the control system or after resetting the block (R1: off $\to$ on $\to$ off) and it is indicated by the output $RDY = off$ .

Inputs

u	Analog input of the block	Double (F64)
R1	Block reset	Bool
y0	Initial output value	Double (F64)

Outputs

y	Delayed input signal	Double (F64)
RDY	Ready flag indicating that the buffer is filled with the input signal samples	Bool

Parameter

n	Delay (number of samples). The resulting time delay is $n \cdot T_{S}$ , where $T_{S}$ is the block execution period. $↓$ 0 $↑$ 10000000 $⊙$ 10	Long (I32)
nmax	Limit for parameter n (used for internal memory allocation) $↓$ 10 $↑$ 10000000 $⊙$ 100	Long (I32)

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