The traffic lights at the crossroads are as follows: First, the control requirements (1) The signal lamp system is controlled by a start switch. When the start switch is turned on, the signal lamp system starts to work. When the start switch is turned off, all the signal lights are extinguished. (2) North and South Green Lights and East and West Green Lights cannot be illuminated at the same time. If you turn on the signal system at the same time, it will alarm immediately. (3) The north and south red lights remain for 25s. In the north and south red light is lit at the same time, the green light is also on, and maintain for 20s. By 20s, the green light flashes, flashes off after 3s, at this time, the yellow light is on, and it stays for 2s. By 2s, the yellow light goes out and the red light goes on. At the same time, the red lights in the north and south are extinguished and the green lights in the north and south lights. (4) Keep red light for 30s. The north-south green light stays on for 25 seconds, then flashes for 3 seconds and goes out. At the same time, the yellow lights in the north and the south remain on for 2s and then go out. At this time, the north and south lights are on and the green light is on. (5) The sequence of north-south and east-west traffic lights alternately and alternately, commanding the traffic at the intersection, is as follows. Second, PLC wiring Third, define the symbol address Fourth, the ladder program The following is a schematic diagram of a three-story elevator. The rise and fall of the elevator are controlled by a single motor; when the elevator is raised and reversed during forward rotation, the elevator is lowered. Each floor is provided with a call switch (SB1, SB2, SB3), a call indicator (H1, H2, H3) and an in-position limit switch (ST1, ST2, ST3). Control requirements: (1) The call switch of each floor is a button switch, and SB1, SB2, and SB3 are all valid (Instant connection, that is, release is still valid). (2) The elevator car only responds to the ascending call during the ascent of the elevator and only responds to the descending call during the descent. Any call in the reverse direction is invalid and is simply referred to as an irreversible response. Specific action requirements, as shown in the table below. (3) The effective running time between each floor shall be less than 10S, otherwise it is considered that there is a fault and the motor is automatically stopped. The PLC control of various liquid automatic mixing devices is shown as three liquid mixing devices. SQ1, SQ2, SQ3 and SQ4 are liquid level sensors. When the liquid surface is submerged, the liquids A, B, C and the mixing valve are Solenoid valves YV1, YV2, YV3, YV4 control, M is agitator motor, its control requirements are as follows: Initial state When the unit is put into operation, the valves for liquids A, B, and C are closed, and the valve for the mixture is opened for 20 seconds to empty the container and close. 2. Start operation Press the start button SB1, the device starts to operate according to the following given rules: 1 Liquid A The valve opens and liquid A flows into the container. When the liquid level reaches SQ3, SQ3 is turned on, the liquid A valve is closed, and the liquid B valve is opened. 2 When the liquid level reaches SQ2, close the liquid B valve and open the liquid C valve. 3 When the liquid level reaches SQ1, close the liquid C valve and stir the motor to start stirring. 4 Stir the motor and stop stirring for 1 min. The mixing liquid valve opens and the mixed liquid begins to evolve. 5 When the liquid level drops to SQ4, SQ4 turns off by turning on, and after another 20s, the vessel is empty and the mixture valve closes and the next cycle begins. 3. Stop the operation After pressing the stop button SB2, the operation will not be stopped until the current mixing operation is completed (stopped in the initial state) Reference procedure: Neon advertising screen controller design Using the PLC to control the neon advertising screen, the specific requirements are as follows: The time sequence of the eight lamps in the middle of the advertisement screen is on and off is 1st bright→2nd bright→3rd bright→...→8th bright. The time interval is 1s. After full bright, 10s is displayed. Extinguish from 8→7→...→1. After it is completely off, it is turned off for 2 seconds, and then it is turned on from the 8th lamp. The sequence is lit 7→6→...→1. The time interval is 1s, the display is 20s, and then it goes out from →2→...→8. After it goes out, stop for 2s, start from scratch, and start again. Refer to the ladder diagram program: Design the program so that the two cylinders act in sequence, in the order: A1B1B0A0. (a) Air control loop (b) Displacement-step diagram (III) Analysis of type I obstacle signals (D) PLC wiring (v) Define symbolic addresses (VI) Ladder Diagram Program PLC Control of Vending Machines The schematic diagram of the vending machine shown below is as follows: 1. This vending machine can invest 1 Yuan, 5 Yuan or 10 Yuan coins. 2. When the total coin value is more than 12 yuan, the button of the soda button is on; when the input is hard When the total currency value exceeds 15 yuan, the soda and coffee button indicators light up. 3. When the soda button light is on, press the soda button and the soda will automatically stop after 7 seconds. During this time, the soda indicator will flash. 4. When the coffee button light is on, press the coffee button and the coffee will automatically stop after 7 seconds. During this time, the coffee light will flash. 5. If the total amount of coins to be invested exceeds the amount of money required for the button (sweat 12 yuan, coffee 15 yuan), the change indicator light will be on, indicating that the money will be taken and the excess money will be withdrawn. Reference answer: Budget Laptop
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