( 1 ) In recent years , and Lee Mining PLC product innovation , its reliability, performance and other advantages have been widely recognized by users. And Lee mineral widely used in low voltage feed switch , high Nanda Power supply module plc voltage power distribution equipment , combination switch , load center and other products with PLC products are gradually replaced protectors and ordinary PLC microcontroller products , equipment and mine started when Lee became some of the PLC mining equipment and advantages of selling the company's products .
( 2 ) the use of PLC to develop a new type of solar thermal water heaters, solar water heaters can overcome the traditional presence affected by climate , temperature instability and other defects , but also focus on water supply for multiple users. Siemens S7-200 series PLC control operation of solar thermal water heaters with water temperature , water PLC Programmable Logic Controller level and flow control corresponding temperature , level and flow sensors and PLC analog input extension implementation. Meanwhile , PLC and Siemens integrated text display T D400 achieve interactive interface for the collector water heater temperature and water level inside the real-time online display and settings.
( 3 ) With the development and social progress of science and technology, automatic doors in everyday life has also been widely used. Automatic door systems in the past generally use logic control module , due to the high failure rate , low reliability , convenient maintenance and other reasons, will be phased out . Used Mitsubishi PLC automatic door control system as a controller to a transmitter and a receiver of ultrasonic switch photoelectric switch as an input device of the system, two different sensor input control signal to the PLC, the PLC system using code tables , I / O allocation table and automatic door control actions such as the implementation process in order to achieve control of the door open or closed ( rising or falling ) .
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