How can I observe an entity passing from one block to another?

I have a server block, a router, and another servers each on one of the two routes as seen below. I am trying to generate a signal like a pulse, message, etc. everytime an entity passes from the top path, but not the bottom.

I tried using the "Entity Replicator" on the top path and writing some functions on the replicated entities, but it messed up with the timings I need in other functions I have in S1 and S2. In other words, my outputs are different when I use the entity replicator on the path than when I don't. Does anyone have any ideas on how to do this?

Answer 1

[Altaïr]

Hey @Arshya Feizi,

To generate a pulse signal each time an entity passes through the top path, an Entity Server combined with a Difference block can be utilized. Here's how it can be set up:

In the model, I have introduced a temporary Entity Server named "Dummy Server." Set its Service time to 0 and its Capacity to a very high value.

In the Statistics tab, ensure the "Number of entities departed, d" checkbox is selected. The output signal 'd' will be a step-type signal that increases by one unit each time an entity leaves the "Dummy Server."

To obtain a pulse-type signal, pass this signal through a Difference block, as depicted in the setup.

You can read more about the two blocks using the following commands:

Entity Server

web(fullfile(docroot, 'simevents/ref/entityserver.html#d123e23441'))

Difference

web(fullfile(docroot, 'simulink/slref/difference.html'))