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System Design a. Analyze the equipment or systems you control. The main purpose of PLC is to control external systems. This system may be a single machine, a fleet or a production process. b. Determine whether the input and output points of the device or system you want to control meet the point requirements of the programmable controller. (Selection requirements) c. Determine the complexity of the device or system you want to control, and analyze whether the memory capacity is sufficient. 2. I/O assignment (assign input and output) a. Assign the input signal of the device or system you want to control, corresponding to the input number of the PLC. (List) b. Assign the output signal of the device or system you want to control, corresponding to the output number of the PLC. (List) 3. Design the control schematic diagram a. Design a more complete control sketch. b. Write your control program. c. Simplify the process as much as possible while still achieving your control objectives. 4. Write the program to the PLC. Write your program to the programmable controller. 5. Edit, debug and modify your program a. Program error checking (logic and syntax checking) b. Insert END locally and debug the program segmentally. c. Overall operation debugging 6. Monitor the operation situation. In the monitoring mode, monitor whether each action of your control program is correct. If incorrect, return to step 5. If correct, proceed to step 7. 7. Run the program (don’t forget to back up your program) This post was last edited by wopale3 on 2009-4-2 15:52 ]