1. 1 design background of this project 2

1.2 Design content of this project 3

1.3 Purpose and significance of this project design 3

2. Determination of system control scheme 4

2. Overview of1automated warehouse 4

2.2 Advantages of adopting PLC to control stereoscopic warehouse 4

2.3 Basic steps of system design 5

2.4 System Control Scheme 6

2.5 Determination of technical parameters of three-dimensional warehouse 7

3. System Hardware Design 8

3. 1 structural design of control system 8

3.2 Selection of Programmable Controller (PLC) 8

Overview of PLC 9

PLC selection of PLC 9

3.3 Selection of stepper motor 1 1

3.3. The principle of1stepper motor 1 1

3.3.2 Selection of stepper motor 1 1

3.4 Selection of stepper motor driver 14

3.5 Selection of sensors 16

3.6 Selection of microswitch 18

3.7PLC input/output allocation table 18

3.8 electrical schematic design 19

4 system control software design

4. Overview of1PLC ladder diagram 20

4.2 Features of Mitsubishi Programming Software 2 1

4.3 System Flow Chart 22

4.4 Ladder Diagram Design 23

5. System debugging and conclusion 24

5. 1 Download (call) of ladder diagram program 24

5.2 Conclusion 25

Appendix IPLC Design Ladder Diagram 26

Reference 37

Acknowledgement 37