【正文】
s industries. threerow, threerow, 6+6+9, twentyone parking space is designed to study the overall structure of the threedimensional parking garage and its operating principles. the hardware system of the liftandthrow parking garage. The contents include: the main circuit design, manual control system design, PLC peripheral hardware design, drawing the garage main circuit diagram, manual control circuit diagram and PLC peripheral circuit wiring diagram. the software system for lifting and moving the threedimensional parking garage. The contents include: the overall introduction of PLC, the choice of PLC programming language, the design of the main flow chart of the program, the flow chart of each basic function program, and the preparation of the ladder diagram program according to requirements.5. Use S7200 simulation software to carry out online s