Chapter 3 PLC System Configuration & Settings 3.2.2 Module Configuration 3.2.2.1 Add Module Method 1 Select the desired module from the left Product List regarding AH series and drag that module to the desired vacant slot on the right. *. When a selected module is dragged to the system configuration area on the right, the module is placed in a vacant slot. The system does not allow the selected module be placed in an existed module slot. Method 2 For AH series PLCs, double-click a vacant slot or right-click the slot and choose Add . For AS series PLCs, double-click on the position or right-click the position and choose Open . AH Series 3-119