本文介绍了利用人机界面(HMI)、变频器(VVVF)和 PLC 构成的多功能小型恒压供水系统的设计与实现。该系统具有自动化程度高、便于维护、耗电量小等优点。广泛适用于乡镇、农村等基础设施薄弱地区。 This article describes the design and implementation of a multi-functional small constant pressure water supply system using a human-machine interface (HMI), a frequency converter (VVVF) and a PLC. The system has a high degree of automation, easy maintenance, low power consumption and other advantages. Widely used in villages and towns, rural areas and other infrastructure is weak.