Why does the port_label function on my mask not work as expected for physical signals in Simulink 7.4(R2009b)?

I have created a mask on a subsystem that contains physical connections. I have tried to use the following syntax to change the label of my ports on the mask, but it does not work as it does for Simulink signals:

port_label('input', 1, 'my_label')

Answer 1

[MathWorks Support Team]

This is expected behavior. In order to apply labels to physical connections you have to use 'lconn' or 'rconn' as the port_type. 'input' and 'output' can only be used for Simulink signals.

Example:-

port_label('rconn', 1, 'my_label');