Modular Program Structure ■ Traditional program structure ■ Modular program structure Errors are often found in large-scale programs under a traditional structure. It's hard to debug with increased maintenance cost. Programming organization unit (POU) enables easy management in large-scale programs with high development efficiency. ▪ Main program (Cyclic) Step 1 . . ▪ Joint development Step 1 . . Step 2 . . Different programming units are jointly developed by different engineers, enhancing development efficiency Step 2 . . Step 3 . . Step 3 . . ▪ Pause execution of POUs Temporarily stop the function of certain POU for debug and maintenance ▪ Interrupt subprogram Step 4 . . Step 4 . .
▪ General subprogram FB A . . SubprogramA . . ▪ Individual encryption Subprogram B . . FB B . . POU can be encrypted individually to protect know-how and intellectual property ■ Modular Program Structure ▪ Task manager Display panel of task manager Plan the execution sequence of POUs and define the nature of the tasks (cyclical or interruptive) ▪ POU management Manage all POUs via project tree and support POU import / export for joint development or other uses ▪ User library Built-in variety of Delta developed FBs. Users can add frequently used FBs to the library for future use. 16