Dairy imports HS code references

List of contents of this article:

• 1. Crossroads Traffic Signal Control Programming
• 2,Dairy imports HS code references plc traffic light design
• 3, Design paper on PLC traffic light control?
• 4, single-chip Machine-controlledTraffic light
• 5, Fuzzy control system design based on PLC traffic light
• 6, Design an intersection traffic light control circuit with non-gate

intersection traffic light control program design

1, f (a, b, c), when f is equal to 1 North-south traffic, f is equal to 0, east-west traffic, a is the north-south special situation probe, b is the east-west special situation probe, assuming that the special situation is 1, no is 0, c is the north-south vehicle probe, c is 1 indicating that there are vehicles in the north and south, and 0 means that there are no vehicles.

2. Design an intersection three-color signal light indication control program (with sidewalk indicator signal light) to indicate the passage of passing vehicles and pedestrians. The automatic cycle process of traffic signal lights is shown in the following table. Start function: After pressing the start button SB1, the traffic light enters the automatic cycle indication. Status.

3. F (A, B, c), when F=1, it is the north-south traffic; when f=0, the flow in the east-west direction, A is the special situation probe in the north-south direction; B is the special situation exploration in the southeast direction, assuming that the special situation is 1, there is no 0, C is the probe of the north-south vehicle, c is 1, there is south Vehicles to the north, 0 means that there are no vehicles.

4. PLC control trapezoid diagram design The intersection is equipped with three signal lights of red, yellow and green in the north-south and east-west directions of the intersection, and the six lights work in a certain chronological order.

5. The process of opening the loop to control the traffic light at the intersection is as follows: set the timer or logic of the traffic signal so that it can automatically change the color of the traffic signal according to the preset time interval or logic. For example, the red light means "stop" and the green light means "do".

plc traffic light design

Using PLC, the sensors described above can be made and The traffic lights at each exit are directly connected to it, which is very convenient and reliable. In this design example, the PLC selects FX2N-64, whose input end receives the output standard electric pulses measured by vehicle detectors from various intersections, and the output is connected to the red and green signal traffic lights at the intersection.

Use the computer to design and program. Turn on the start button, and the signal light will start working. The north-south red light and the east-west green light will turn on at the same time. East and west, the four yellow lights in the north and south flash 5 times at the same time (5 seconds) and then go out. The east and west red lights are on, and the north and south green lights are on for 20 seconds.

A brief introduction analyzes the current situation of modern urban traffic control and management problems, and explains the working principle of the traffic light control system in combination with the actual situation of urban and rural traffic. This design introduces the application of PLC to realize the automatic control of traffic lights at intersections.

Whether it is an arrow or a lamp, it corresponds to 1 output point in PLC, so this is 9 output points. The T-junction is regarded as the intersection of A, B and C.

PLC-based system designScheme The PLC control system of the fully automatic washing machine is shown in Figure 1. The system consists of PLC controller, relay, button switch, selection switch, limit switch, etc.

After a month of hard work, the paper on traffic light design based on PLC was finally completed. Thinking back on choosing this project at the beginning, I was at a loss and didn't know how to start. Finally, at the suggestion of the instructor, I first collected information on the Internet, and then combined with the knowledge I had learned before, I designed the plan after conducting an actual investigation, and finally completed the thesis.

Design paper on PLC traffic light control?

1. The flow rate of the vehicle and the duration control of the traffic light can be realized by the programmable controller (PLC). Of course, other types of computers can also be used as controllers.In this example, PLC is selected as the controller because the core of the programmable controller is a computer, which is specially designed and manufactured for industrial environment applications.

2. Briefly introduce and analyze the current situation of modern urban traffic control and management problems, and explain the working principle of the traffic light control system in combination with the actual situation of urban and rural traffic. This design introduces the application of PLC to realize the automatic control of traffic lights at intersections.

3. According to the theoretical research results of the fuzzy control system that determines the time of the signal light according to the front and rear phase flow rate, the method of using PLC to realize the fuzzy control of a single intersection traffic light. Taking a single intersection 4-phase traffic light as an example, the PLC is used as a fuzzy controller and adopts a trapezoid diagram. Cheng.

4. After a month of hard work, the paper on traffic light design based on PLC was finally completed.Thinking back on choosing this project at the beginning, I was at a loss and didn't know how to start. Finally, at the suggestion of the instructor, I first collected information on the Internet, and then combined with the knowledge I had learned before, I designed the plan after conducting an actual investigation, and finally completed the thesis.

5. Research Paper on traffic lights I Abstract: This article introduces the system design and system control plan of traffic lights. The traffic light control system designed by this plan is based on a single-chip microcomputer. This system adopts MSC-51 series single-chip microcomputer AT89S51 as the central device to design the traffic light controller.

6. This article mainly introduces how to use PLC to control traffic lights at intersections.

Single-chip microcomputer-controlled traffic light

1. In a single-chip microcomputer, the counter and timer are usually designed as a component - the counter. When the period of the counting pulse is certain, the counter is used as a timer, and the timing time is the product of the number of counts of the counter and the counting pulse period. What we use here is the timing function of the counter.

2. Time through the programmable timer inside the single-chip microcomputer. The main idea of the single-chip microcomputer control traffic light design is to time it through the programmable timer inside the single-chip microcomputer, and change the status of the current traffic light according to the established rules after a certain period of time.

3. Using 51 single-chip microcomputer as the MCU of the system, it is basically completed to control the two sets of traffic indicator lights alternately. Each street corner has three indicator lights: left turn, straight and pedestrian. Each straight light has three colors: red, yellow and green.Bicycles and cars share left and straight lights.

4. Table 1 Control relationship between traffic lights and single-chip microcomputer 1R 1Y 1B 1R 1Y 1BP5 P4 P3 P2 P1 P0 north and south red light north and south yellow light north and south green light east and west red light east and west yellow light east and west green light main program executes the control of each usage bit of P1 port, And call the corresponding delay subroutine to implement.

5. The circuit diagram of the automatic controller of the traffic road traffic light is the automatic control circuit of the traffic road traffic light. The controller is mainly composed of four 555 (IC2 to IC5) and some resistance components, which is connected at the beginning and end of the four-level monosteady-state delay circuits. The input 8V voltage is stabilized by 78M05 and the power supply voltage of VDD=+5V is provided for 555.

Fuzzy control system design based on PLC traffic light

The theoretical research results of the fuzzy control system to determine the time of the signal light according to the front and rear phase flow, and use PLC to realize a single intersection traffic The method of fuzzy control of the trumplight, taking a single intersection 4-phase traffic light as an example, takes PLC as a fuzzy controller and adopts trapezoid diagram programming.

The design of the street lamp control system based on PLC can improve the management efficiency of street lamps and save energy and reduce emissions. By using sensors and PLC equipment, the system can automatically control the on and off of street lights according to the ambient brightness and needs, so as to reduce energy waste.

In this design example, PLC chooses FX2N-64, whose input terminal receives the output standard electric pulse measured by vehicle detectors from various intersections, and the output is connected to the red and green signal traffic lights at the intersection. Selection of signal light: In this example, red, yellow and green light-emitting diodes are selected as signal lights (arrow direction type).

First of all, the design of the PLC street lamp control system needs to take into account the automatic switching function of the street lamp. Through the sensor to sense the brightness level of the surrounding environment, the PLC can judge whether the street lights need to be turned on or off according to the preset brightness threshold.

Design an intersection traffic signal control circuit with non-gate

1. If the input is high-level (1), the output is low-level (0);If at least one of the inputs is low level (0), the output is high level (1). And non-gate is a general logical gate, because any Boolean function can be implemented with and non-gate.

2. Design an intersection traffic light control circuit with non-gates. Design requirements: the north-south direction is the main channel, and the east-west direction is the secondary channel. Only when there are no vehicles in the north-south direction, vehicles in the east-west direction are allowed to pass. No is 0, c is the north-south vehicle probe, c is 1 means that there are vehicles in the north and south, and 0 means that there are no vehicles.

3. The traffic light control circuit consists of a D trigger, a three-input or door and two phase inverters. The function of the D trigger is to control the conversion of traffic lights when the country road is very busy.

4. F (A, B, c), when F=1, it is north-south traffic;When f=0, the flow in the east-west direction, A is the special situation probe in the north-south direction; B is the special situation probe in the southeast direction, assuming that the special situation is 1, there is no 0, C is the probe of the north-south vehicle, c is 1, there are vehicles in the north-south direction, and 0 means that there are no vehicles.

5. Set up a traffic signal light alarm circuit at an intersection: when the red, yellow and green traffic lights are on separately, or when the yellow and green lights are on at the same time, it is normal, and other situations are abnormal. When the abnormal situation is set, the circuit outputs a high level (Y=1) to indicate the alarm, trial and non-door Now this logical function.