Entity Transport Delay

Introduce a delay in propagation of a SimEvents message

Since R2019b

• 

Libraries:
Simulink / Continuous
SimEvents

Description

The Entity Transport Delay block delays an entity for a period of time, named transport delay. The first input is the entity that is transported from point A to point B on a constant-length moving surface whose speed changes over time. The value from the second input is the instantaneous delay. The speed of the surface is the reciprocal of instantaneous delay. The product of instantaneous delay and the speed is 1.

The block calculates the implemented transport delay by the distance-speed-time relationship, where the surface length (distance) is equal to the integral of the variable surface speed over the duration of the transport delay (time). For more information about this calculation, see Variable Transport Delay.

The Entity Transport Delay block connects SimEvents^® to Simulink^® using the input from a Simulink signal and computing the transport delay as a continuous process, and applying this delay to an entity in a discrete-event process. For an example that uses the Entity Transport Delay block, see Modeling Cyber-Physical Systems.

Examples

Modeling Cyber-Physical Systems

Model transport delay in a variable speed conveyor belt.

Ports

Input

Port_1 — Input entity

SimEvents entity

SimEvents entity or message. For more information on entities in SimEvents, see Entities in a SimEvents Model.

This port does not have direct feedthrough.

t_i — Instantaneous delay

scalar | vector | matrix

Instantaneous delay in the transport of the SimEvents entity. t_i is the reciprocal of the speed of the entity. For more information on the calculation of instantaneous delay, see Variable Transport Delay.

This port has direct feedthrough.

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32 | bus

Output

Port_1 — Delayed entity

SimEvents entity

SimEvents entity with the instantaneous delay t_i applied to it.

n — Number of delayed entities

real scalar

Secondary output signal of the block, which displays the number of entities processed in a time step.

Dependencies

To enable this port, enable the Output number of entities in block, n parameter

Data Types: double

Parameters

Capacity — Specify the capacity of the block

inf (default) | scalar

Specify capacity to accept entities to be delayed.

Programmatic Use

Block Parameter: Capacity

Type: character vector

Values: 'inf' | real scalar

Default: 'inf'

Output number of entities in block, n — Outputs the number of delayed entities present in the block

off (default) | on

Number of entities present in the block that are being delayed.

Programmatic Use

Block Parameter: ShowNumberEntitiesInBlock

Type: character vector

Values: 'on' | 'off'

Default: 'off'

Block Characteristics

Data Types	Boolean | bus | double | enumerated | fixed point | integer | single
Direct Feedthrough	no
Multidimensional Signals	yes
Variable-Size Signals	no
Zero-Crossing Detection	yes

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2019b