自动门是随着人们对生活条件的不断追求、计算机，网络技术，通信技术的不断

Automatic doors are high-tech products that come into being with people's continuous pursuit of living conditions, the continuous development of computer, network technology, and communication technology. Therefore, it has the advantages that ordinary doors do not have: simple and simple, and it is safer, more convenient and faster to use and manage. At the same time, the automatic door uses infrared sensors to monitor whether someone is approaching, so that it can be left unattended. It is convenient and improves the grade of the building. Unlike ordinary doors that need to be kept open all the time, it saves air conditioning energy, windproof, dustproof and other advantages. Therefore, automatic doors are widely used in large shopping malls, hotels, banks, airports, office buildings and other large public places. <br>This article combines the introduction of PLC control system and the characteristics of various commonly used automatic doors to give an overview of the automatic doors controlled by PLC. The main classification, composition, principle, software and hardware control system, PLC program compilation, etc. have all been introduced to a certain extent.

Automatic door is with people's constant pursuit of living conditions, computers, network technology, communication technology, the continuous development of high-tech products. As a result, it has advantages that ordinary doors don't have: simplicity, and more secure, convenient, and fast to manage. At the same time, the automatic door uses infrared sensors to monitor whether anyone is near, which also enables unattended. Both convenient and improve the grade of the building, unlike ordinary doors need to be open all the time, it also saves air conditioning energy, wind, dust and other advantages. Therefore, automatic doors are widely used in large shopping malls, large hotels, banks, airports, office buildings and other large public places.<br>In this paper, combined with the introduction of PLC control system and the characteristics of various general applications of automatic doors, PLC as the control system of automatic doors. The main classification, composition, principle, hardware and software control system, PLC program writing, etc. are introduced.

Automatic door is a high-tech product with the continuous pursuit of people's living conditions and the continuous development of computer, network technology and communication technology. Therefore, it has the advantages that ordinary doors do not have: simple and simple, and the use and management is more safe, convenient and fast. At the same time, the automatic door uses the infrared sensor to monitor whether someone is close to it, so as to realize unattended. It is convenient and improves the grade of the building. Unlike ordinary doors, which need to be open all the time, it also has the advantages of saving air conditioning energy, windproof and dustproof. Therefore, automatic doors are widely used in large shopping malls, hotels, banks, airports, office buildings and other large public places.<br>In this paper, by combining the introduction of PLC control system and the characteristics of various commonly used automatic doors, the general situation of automatic doors controlled by PLC is introduced. The main classification, composition, principle, software and hardware control system, PLC programming are introduced.<br>