programming simple, easy to use and small size, light weight, a series of low-power advantages in industrial applications e more extensive. This paper focuses on the PLC in the canned beverage production, The design of an automatic sorting device with low cost and high efficiency is presented in the paper, which regards programmable logic controller ( PLC) as the master controller bines pneumatic device, sensing technology, position control and other technology to implement automatic selecting of the products live. The device is characteristic of high automation, steady running, high precision and easy control, which can fulfill the requirement according to different situations with little modifications . Key words : programmable logic controller ; sorting device ; control system ; sensors
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