ABSTRACT
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 popula
tion, the vending machine is playing a more and more important role
in people's life, in the long run it has broad space for developm
ent. 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 re
staurant. First, by comparing with the single chip microcomputer
and hydraulic control, and adopt PLC to control the vending machine, t
hen 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, accor
ding to the hardware block diagram, select the desired PLC currency rec
ognizer, motor and contactor. According to the I/O distribution l
ist on the PLC selection, and draw the external wiring diagra
m. 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 compilatio
n done by GX Developer, complete ladder diagram can be debugged
and simulated in Mitsubishi PLC simulation software GX Simulator 6c. Fin
ally, 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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