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ModMultiSim help v3.07 - 4.4.6. Modelling propagation - a delay line
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The Timers section contains examples of delaying the turn-on or turn-off of an output.
But if you need to model a delay in a value due to propagation (e.g. temperature change propagated by conduction, or composition change propagated by flow through a pipe), then a "delay line" is needed.
A delay line is a sequence of registers, through which a value is shifted, one step per cycle.
Table 26. Delay line
| Register Address | Register Name | Statement |
|---|---|---|
| $100 | Value | |
| $101 | Value 1 | $100 |
| $102 | Value 2 | $101 |
| $103 | Value 3 | $102 |
| $104 | Value 4 | $103 |
| $105 | Value 5 | $104 |
| ... | ... | ... |
$101 contains the Value delayed by CycleTime, $102 contains the Value delayed by 2 * CycleTime, and so on.
Using thermal conduction as an example, register $105 might contain the temperature of the external surface of a container that was the temperature of the inner surface of the container, in $100, 10 seconds earlier (where CycleTime = 2 seconds).
If required, the value could be attenuated as well as being delayed - one might do this, for example, to model some heat dissipating as it is conducted from the inner to the outer surface of the container:
Table 27. Delay line with attenuation
| Register Address | Register Name | Statement |
|---|---|---|
| $100 | Value | |
| $101 | Value 1 | $100 * 0.96 |
| $102 | Value 2 | $101 * 0.96 |
| $103 | Value 3 | $102 * 0.96 |
| $104 | Value 4 | $103 * 0.96 |
| $105 | Value 5 | $104 * 0.96 |
| ... | ... | ... |