AH500 Quick Start Users can create a function block which contains the relation among the underground pool, the water tower, and the pump. Right-click in the window at the left side of the main screen of the software to add a new POU. Type “FB_SPP_Sys” in the POU Nam e box, and then type “Supply Water Pump Control Function” in the POU Comment box. Finally, click OK . Users can see the FB_SPP_Sys window on the main screen. Users need to create the local symbols. In order to make the use of the function block more convenient, the system automatically distributes the addresses to the module, and users are not 2-20