SPNPM22 ABB

Simplified program structure:PLC program structure is usually very simple,typically block structure,different blocks perform different functions,so that the program debugger has a clear concept of the control function and control sequence of the entire program

简化的程序结构：PLC的程序结构通常很简单，典型的为块式结构，不同块完成不同的功能，使程序的调试者对整个程序的控制功能和控制顺序有清晰的概念