至东门（East Gate）.doc

至东门（East Gate） To the east gate of.Txt for a person, will estrus of two people, will have a passion three of us are walking together, there will be. It is not cherish. Real girls arent perfect, perfect girls arent real. Take it easy, lose it, go with the flow and fight for it. Design task book Design topic: PLC control system of automatic door Design requirement: (1) when the photoelectric detection switch detects that someone has passed, it opens the door automatically. (2) set the automatic door with timer, the automatic control time is 8 seconds. (3) when a person passes, he arrives at the appointed time and closes the door automatically. (4) in the process of closing, if another person passes the photoelectric detecting switch, the utility model can stop the door immediately and enter the door opening state, and then reset the timer for 8 seconds. (5) when someone is standing in front of the door without entering, the detection switch always detects the signal. When the timer is in a cycle timing state, the keeper will keep it open. Design schedule: The first week: data collection, preliminary questions. The second week: according to the data collected for program selection, and outline the outline. Third weeks: collect data and design automatic door procedure. Week 4: modify the program and complete the debugging. Fifth weeks: find data, design automatic door structure. Sixth weeks: PLC I/O distribution, peripheral circuit design. Seventh week: review the electronic manuscript and typeset. Eighth weeks: print and complete the final defense. Abstract In China, where the economy is booming, the big cities, such as buildings, hotels, hotels, banks, shopping malls, office buildings and automatic doors, are everywhere. Automatic doors can not only bring us convenience for people to go in and out, save air conditioning energy, prevent wind and dust, reduce noise, but also add a lot of noble and elegant atmosphere to our doors. The programmable controller (PLC) based