Abstract: As the application of intelligence becomes more and more widespread, the early automatic door system adopts relay logic control, which has high failure rate, poor reliability and difficult maintenance, and has been gradually eliminated. Automatic doors controlled by PLC are widely used because of their low failure rate, high reliability and easy maintenance. This article introduces the application of OYES-plc200 series in automatic door control, through which the most intelligent and safest response speed scheme is designed.
One. The development trend of automatic door industry1. Intelligent and multifunctional; it can automatically detect the door opening and closing stroke position, and automatically adapt to the change of the door body resistance, so as to always maintain a high sensitivity of protection against obstacles.
2. Maintenance-free; take a variety of measures to reduce maintenance work during use.
3. Diverse words; according to the needs of users, produce a variety of products with different appearances and functions.
4. High security; no people will be caught or the door will not be opened.
two. Automatic door control system design scheme1. Automatic door function requirements
This design is suitable for most of the entrances of hotels, shopping malls, banks, and buildings. According to this, the designed automatic door needs to have the following control functions.
a. The door opening and closing control should have manual and automatic methods for the convenience of maintenance.
b. Emergency stop, it can be stopped quickly when there is a trapped person or an emergency situation.
2. Automatic door control requirements:
figure 1
The automatic door control is roughly shown in Figure-1,
a. When a person enters the infrared sensor area, the door opening motor starts, and the door opens automatically until it hits the door opening stop position, and the deceleration should be added when the stop position is approaching.
b. After opening the door for 7 seconds (the time can be set freely), if no one is in the elliptical area of ​​the infrared sensor, the door closing motor starts and the door closes automatically until it hits the door closing stop position, and it needs to slow down and close when it reaches the stop position.
c. If someone enters the elliptical area of ​​the infrared sensor during the door closing process, the door should stop closing immediately and execute the door opening action.
d. Also need an emergency stop button and automatic and manual switch button
I/O distribution point (using OYES200CPU224c)
I/o point control description
I0.0 infrared sensor
I0.1 Door opening stop position
I0.2 Close the door stop position
I0.3 Open door deceleration position
I0.4 Closed door deceleration position
I0.5 emergency stop
I0.6 automatic and manual switching
I0.7 Manually open the door
I2.0 manual closing
Q0.0 controls the motor to rotate forward to open the door
Q0.1 Control the motor to reverse and close the door
Q0.2 Motor slow output
The program is written as follows:
Program description: 1. Manual operation is not allowed in automatic mode, and manual switching is required. Emergency stop can be used as a stop button for manual operation.
2. When I0.0 senses someone, it will open the door automatically and close the door after 7 seconds. If there is someone during the closing process, the door will open automatically.
three. to sum upUse PLC as the core to control, its circuit structure is simple, the unit circuit is designed through the schematic diagram and the ladder diagram language design is completed, the conditions provided by the laboratory are used to simulate and verify the program, and the indicator light is used to realize the system function, which is very suitable For daily life control occasions. This design may need to be modified in actual application to meet the requirements. Using the simplest way to achieve the most intelligent operation is the direction of future development. The application market of PLC will become more and more extensive, for the automatic intelligence of all walks of life, research and development of products required by customers.
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