Scratch在PLC自动编程中的开发与应用

Development and application of Scratch in PLC automatic programming

不同厂家、型号的可编程逻辑控制器(programmable logic contrllor,PLC)都有其专用的集成开发环境,因此互不兼容且程序编写和修改较为抽象繁琐。针对上述现象设计开发出一套基于Scratch平台的PLC自动编程系统,该系统针对Scratch图形化编程平台进行二次开发,通过拖拽元器件模型、编制积木块程序完成虚拟组态的设计,然后基于Qt上位机软件进行人机交互,主要通过Scratch资源文件解析算法、PLC源代码自动生成算法以及PLC指令语句格式校验算法实现预期功能。经过实例验证,表明该系统能将可视化的表达方案转换得到可执行PLC源代码,有效提高了工控领域PLC编程的效率,可广泛应用于PLC控制系统的设计维护工作。

Programmable logic controllers(PLC)with different manufacturers and models have their own dedicated integrated development environments,so they are not compatible with each other,and the program writing and modification is more abstract and tedious.In response to the above phenomenon,a PLC automatic programming system was designed and developed based on the Scratch platform,which was used for secondary development of the Scratch graphical programming platform.The virtual configuration design was completed by dragging and dropping component models and programming building block programs.And then human-computer interaction was performed based on Qt upper computer software.The expected functions were achieved mainly by Scratch resource file parsing algorithm,PLC source code automatic generation algorithm and PLC instruction statement format verification algorithm.After verification by an example,it shows that the system can convert the visual expression scheme into executable PLC source code,which effectively improves the efficiency of PLC programming in industrial control field and can be widely used in the design and maintenance of PLC control systems.