With the development of science and technology, the application of PLC in engineering
everybody be obvious to people, PLC has occupied a space for one person in every field, and
will have a better development. Because of the large number of population, the vending
machine is playing a more and more important role in people's life, in the long run it has
broad space for development. The design of the automatic vending machine for beverage
vending machine, the nature of the goods sold in the clear, adapted to be placed in a short
time population flow of relatively large areas, such as restaurant. First, by comparing with the
single chip microcomputer and hydraulic control, and adopt PLC to control the vending
machine, then analyzes the structure and working principle of automatic vending machines
selling process, understand the vending machine, to prepare for the selection of hardware.
Through vending machine function analysis to make the hardware block diagram, according
to the hardware block diagram, select the desired PLC currency recognizer, motor and
contactor. According to the I/O distribution list on the PLC selection, and draw the external
wiring diagram. According to the flow chart of control system prepared with vending machine
program. If the shopping after the remaining amount, then press the coin button coin.
Trapezoidal chart compilation done by GX Developer, complete ladder diagram can be
debugged and simulated in Mitsubishi PLC simulation software GX Simulator 6c. Finally,
MCGS made the configuration effect. Configuration simulation diagram of the vending
machine comprises a button, indicator light, the slot, fetching port, a coin refund part.
Keywords: vending machine; PLC; ladder diagram; MCGS
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