Chapter 4 Operating ISPSoft 4.5.1 Adding a Ladder Diagram (1) Right-click Programs in the project management area, point to POU on the context menu, and click New … . (2) Type a program name in the POU Name box, select the Ladder Diagram (LD) option button in the Language the project management area. The item is a program organization unit (POU). section, and retain the other default values. Click OK after the setting is complete. An item will be under Programs in 4_ 4-19