Actually I think what you want is <var:nb_NAME:var>, ie;
You have a brick named "Relay", you need to access its "iteration" variable, so you would do:
onActivate -> Self -> VCE_ifValue [ <var:nb_Relay:iteration> >= 32 ]
That's if I remember rightly, the code is there but I'm not exactly sure if it works.
Also, you can't get the value of a name with multiple bricks assigned to it. It should only get the value of the first one.