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介绍了PROFIBUS现场总线过程控制系统组成和STEP7中的用户程序块。说明了S7-300 PLC中的编程模块。基于语句表STL进行了二阶双容水箱液位控制程序设计。阐述了手动与自动切换功能,可以实现无扰切换。给出了二阶双容水箱液位控制监视界面的显示图。描述了基于语句表STL的水箱液位串级控制程序设计。
Introduced the composition of PROFIBUS field bus process control system and the user program block in STEP7. Describes the programming module in S7-300 PLCs. Based on the statement table STL second-order two-tank water level control program design. Expounded the manual and automatic switching function, you can achieve interference-free switch. The display of the second-order double-capacity tank level control and monitoring interface is given. Describes the STL-based tank level cascade control program design.