cyclic timer?

Hi!

One of my clients bought homeseer with plcbus plugin. Everything works perfect by now.
Now, he wants to automate one of his appliance modules to turn on and off on a very basic schedule.
He wants it ON 10 minutes every 30 minutes. In a ciclyc pattern. he want this to happen when device is on. when dvice is off, it has to be just off.
Is this possible? I can't find an option to do that.

Thanks in advance!