The Programmable Controller is a new type of automated control equipment. Using PLC to replace the traditional relay control, high reliability and control procedures variable, easy to use, has been used in many fields.
The dissertation has discussed the performance characteristic of PLC on the foundation of brief introduction PLC technology.In this paper, in order to resolve the problem of automatic water supply for building using the PLC to control the core of electrical contacts and pressure gauges developed a PLC control water supply system, focusing its work on the principle of its work processes and working methods(With input automatic two motors and use of automatic and manual work both ways), the water supply system under the control requirements, complete with a PLC control the electrical water supply system for application programming. This system of simplified, high reliability and easy to operate easy to grasp.
Keyword PLC；control of water supply systems；electrical control manometer； Flow chart； Trapezium chart
