Propagation Delay
Simulates the time delay in a discrete system.
Description
Block Propagation Delay delays the current signal value by the value set by the delay signal. The block Propagation Delay is well suited for realisation of time delay in a discrete system.
At each simulation step, the block samples the input signal and the input delay signal . The output value of the block becomes the signal value after a delay time compared to the current simulation time .
when
At the beginning of the simulation, the block output value is the value of parameters Initial output . The first sample of the delayed signal determines when the block output changes from the value of the Initial output to the value of the delayed input signal.
when
When the simulation reaches the time , the block output is determined by the signal and delay samples.
, when ,
where
-
- sample of the input signal taken at ;
-
- the delay signal sample taken at ;
-
- simulation time, during which the following signal and delay samples were taken;
-
- delay sample taken at time .
Ports
Input
#
u
—
input signal
scalar
Details
The input signal that the unit delays according to the parameters settings.
| Data types |
|
| Complex numbers support |
Yes |
#
dt
—
delay signal
scalar
Details
The delay signal determines the amount of delay applied at each time step of the simulation. You can use the block Propagation Delay to implement a constant or variable delay.
The values of the delay signal must meet these constraints:
-
The delay signal must contain scalar, real, finite, positive values greater than
128*eps, which is the smallest time resolution supported by the software. -
The output time for samples of the delayed input signal must increase monotonically.
For example, suppose the value of the delay signal is
0.6simulation time0and the next simulation step is executed at time0.5. The delay signal at time0.5must be greater than0.1so that the output delay time for sampling the input signal is greater than the output time for sampling the input signal(0.6). -
When the Run at fixed time intervals parameter is selected, the delay signal values must be greater than the value specified for the Sample time parameter.
| Data types |
|
| Complex numbers support |
Yes |
Output
#
y
—
delayed output signal
scalar
Details
The output signal has the same data type as the input signal.
By default, the output signal has a fixed sampling time in small increments.
When the Run at fixed time intervals parameter is selected, the delay signal values must be greater than the value specified for the Sample time parameter.
| Data types |
|
| Complex numbers support |
Yes |
Parameters
Main
#
Initial output —
initial value of the output signal
Real or complex number
Details
The initial value of the output signal.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |
#
Run at fixed time intervals —
start with fixed time intervals
Logical
Details
This parameters defines the way the block is executed and the interval between steps of the output calculation.
disabled - the block is executed every time the delay for the input sample expires. The output signal has a fixed-in-minor calculation step.
on - the block is executed with the calculation step specified in the parameters Sample Time. The output signal also has a calculation step specified in the parameters . Sample Time.
When selecting the parameters Run at fixed time intervals:
-
Delay signal values must be greater than the value you specified for the parameters Sample Time.
-
Delay signal values that are not integer multiples of the specified calculation step are rounded down to the nearest integer multiple of the calculation step. For example, if the calculation step is
0.1and the delay signal value is0.68, Engee rounds the delay to0.6.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
No |
#
Sample Time —
interval between calculation steps
SampleTime (real number / vector of two real numbers)
Details
Specify the interval between calculation steps as a non-negative number. The delay signal values must be greater than the specified sampling time.
Delay signal values that are not integer multiples of the specified calculation step are rounded down to the nearest integer multiple of the calculation step. For example, if the calculation step is 0.1 and the delay signal value is 0.68, Engee rounds the delay to 0.6.
Dependencies
To use this parameters, select the checkbox Run at fixed time intervals.
| Default value |
|
| Program usage name |
|
| Tunable |
No |
| Evaluatable |
Yes |