Rectangular Pulse Train Creation

Hello,

I am attempting to create a pulse train for my model. I am new to introducing pulses and would like an equation to place on my electrcial potential module to create the following:

Rectangular wave: a) On for 0.1 sec at a voltage (VD), on a 1 second duty cycle (so on for 10% of a cycle)
b) repeating 10 times

Where; VD is my voltage applied.

Thanks for any help you can provide; I know how to create a single rectangle pulse and set voltage paramaters etc.

Regards,
Mike