With the development of society and improvement of people's living standards, the safety of drinking water is increasingly concerned and attended widely. Rational use of of water resources, deep purification of drinking water, automation of water production will be the development trend of the water industry.
The topic of this graduation project is Water Automation System based on CAD, the system consists of PLC (programmable logic controller) and network systems, equipment and instrument systems, video systems and lightning protection and grounding systems. This design is comparison basic, and it's is based on the graphic design.
The PLC uses Siemens S7-400 and S7-300 combination as the basic framework, combines with operating parameters of field devices, and it builds a complete automatic control system, this system has a certain practical value and meaning of promotion.
Key words: Water plant, Automation, CAD, Programmable logic controller