Serial communication between S7-200 series PLC and computer based on free port mode
Xu Guangxian · Journal of Liaoning Technical University · 2004
Serial communication mechanism and characteristic between S7-200 PLC and computer based on free port mode in the project of beer fermentation monitoring system are introduced.It also analyses the context of the communication protocol and its implementation method and some key programs.Practical application shows this scheme is simple and practicable.Also,the reliable performance of communication accords with the field requirement and the scheme has a reference value to develop the same kind of the control system.