针对 PLC 编程软件对 PLC 可视化实时监视的需求，分析周期性数据通信的特点，提出了一种四层架构的可视化通信模型的设计方案，并对四层架构的具体实现进行了介绍。该模型应用于 PLC 编程软件，监控的实时响应和界面刷新性能大幅提高，改善了用户体验，取得了良好的应用效果。%Due to the requirement of real-time communication between PLC monitoring software and PLCs,a visual real-time communication model based on four-layer architecture was put forward and the realization of the model was described in detail.The real-time monitoring response and refresh speed of the PLC monitoring software of this communication mode is upgraded greatly.It proves that the model is practical.
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