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针对宝山钢铁总厂钢管厂控制用西门子早期PLC系统，论述了其I／O口状态监控系统的开发过程和网络系统的布局，给出了软件功能和流程框图，以及典型的生产现场测试实验数据曲线等。该系统可以单机运行，也可联网运行，形成生产状态集中监控系统。只要更改接口硬件，系统方案可以适用于所有类型的PLC系统。
According to Siemens PLC in Baosteel Steel Plant, the development process of I / O port status monitoring system and the layout of network system are discussed. The software functions and flow chart are given, as well as typical test data of production site Curve and so on. The system can stand-alone operation, but also network operation, the formation of centralized production monitoring system. As long as the interface hardware is changed, the system solution can be applied to all types of PLC systems.