How can I create an entity with a signal coming from the departures of a server? in simulink

I have an entity server from which I have activated the number of entities departed in statistics. I want from that signal (departed entities) to create a new entity. Any ideas?

Answer 1

[MULI]

Hi @john,

If you need to create a new entity every time an entity leaves the server, you can follow this approach:

Detect When an Entity Departs

• The number of entities departed signal from the "Entity Server" increases over time (e.g., 0 → 1 → 2 → 3).
• You can use an "Edge Detection Block" to detect these changes.This will generate a trigger signal whenever an entity departs.

Use That Trigger to Generate a New Entity

• Add an "Entity Generator" and set it to event-based mode (instead of time-based).
• Connect the trigger signal (from the "Edge Detection Block") to the "Entity Generator's" event input. Now, a new entity will be created automatically every time an entity departs.

Manage the Flow of New Entities

• You can also use a "Queue" or another "Entity Server" to control entity timing.
• To apply custom logic (e.g., setting entity attributes), you can use a "MATLAB Function Block".

Simulink Implementation

• The "Entity Server" outputs the Number of Entities Departed as a signal, which is processed by the "Edge Detection Block" to detect changes and generate an event trigger. This trigger is converted into a discrete event by the "Triggered Subsystem", which then activates the "Entity Generator" in event-based mode to create a new entity.
• The newly generated entity can be managed using a "Queue" for timing control, modified using a "MATLAB Function Block" for custom attributes, and finally routed into the system via the "Entity Sink".

You can also refer to these documenation links on how to set up event-based entity generation in Simulink SimEvents:

https://www.mathworks.com/help/simevents/ug/generating-entities-when-events-occur.html

https://www.mathworks.com/help/simevents/ug/custom-entity-generator-block-with-signal-input-1.html

[Laurent Royer]

Not sure it's mandatory here, but I'd insert a "Message Send" block between the change detection and the 2nd generator: