Numbering rule of scifunc_block input / output port

In Xcos, when I edit the scifunc_block as below, which port is u1, u2, u3 and y1, y2, y3?
Is there any numbering rule of input / output port number?
For example, from upside to downside u1, u2, u3,… , y1, y2, y3,…
Please teach me.

Hi,

You are correct :

  • u1 is for the first input, u2 for the second input, etc…
  • y1 is for the first output, y2 for the second output, etc…

Dear davidcl

Thank you very much for your reply.
I understood my recognition is correct.

Best regards.