1、 1 摘 要 在众多生产领域中，经常需要对贮槽，贮罐，水池等容器中的液位进行监控，以往采用传统的继电器接触器控制，使用的硬件连接多，可靠性差，自动化程度不高，目前已有许多的企业采用先进控制器对传统的控制器进行改造，大大提高了控制系统的可靠性和自动化程度，为企业提供了更可靠的生产保障。 本文介绍了基于 FX2N 型号的可编程控制器（ PLC），组态软件的液面控制系统的设计方案，采用 PID 算法实现液面的自动控制。利用组态软件设计人机画面，通过串行口和可编程控制器 通信实现控制系统的实时监控，现场数据的采集和处理，其结构简单，监控系统不仅自动化程度高，还具有在线修改功能，灵活性强。 关键词 ：
2、PLC 液面控制 触摸屏 变频 2 Abstract In many areas of production, often need to tank of the storage tanks, tank containers, liquid level of monitoring, the traditional relay-contactor, using the hardware connection, poor reliability, automation degree is not high, many enterprises to adopt advanced controller
3、 to improve the traditional, greatly improving the reliability and degree of automation control system, provides a more reliable guarantee for the production of enterprises. This paper introduces a programmable controller based on FX2N model (PLC), design of liquid level control system configuration
4、 software, using PID algorithm to realize automatic control of liquid level. Using configuration software to design man-machine interface, through the serial port and can realize real-time monitoring control system for communication programming controller, field data collection and processing, the structure is simple, the monitoring system is not only a high degree of automation, but also changes with the online function, flexibility. Key words: PLC level control touch screen frequency converter
