Communication GSM of two PLCs (Simenes Simatic 300)

Hello everyone, I need to setup a configuration in 2 stations Simatic 300 so it can communicat by GSM, I need to know witch bloc to use, and how to configure it, Input in the first station and Output in the second one, sorry for my bad english. and thanx
This is an example for this communication with SImatic 200

up

Seen this?
http://support.automation.siemens.com/WW/view/en/27038105

Yes thanx, I saw it, but its hard to applie that, I need a simple configuration in my project so input in the first station control with GSM communication output in the second station. my problem is, two tank water with distance , the first tank had 3 pumps and those pumps are controled by the water level in the second tank water.