<![CDATA[Water is one of the basic things in human life, even every living thing needs water to survive. But in reality, there are many villages in Indonesia that experience environmental problems, one of which is water pollution. Lack of clean water is a problem in this research. This research aims to find out the design and development of an automatic water purification system based on PLC and HMI, find out how to increase the efficiency of the water purification process through automation, and provide a user interface for monitoring and control of the system. This research method uses the discussion method, literature method, and observation method. Program testing on PLC and HMI-based water purification equipment is using the CX Programmer program and visualization on the CX designer. By using CX Programmer and CX Designer assisted by other PLC and HMI tools or systems, the water purification system can be controlled and monitored automatically. The water purification system can improve the efficiency of the water purification process through the development of CX Programmer and CX Designer programs such as program performance monitoring, process control, data review, analysis and inspection of the system. Integrating CX Programmer and CX Designer through the same observation of each CX Designer object with the instructions in the CX Programmer program created and can involve between CX Designer software installed on a laptop for PL.]]>
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