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1. Design and debugging of PLC ladder diagram control program for beverage filling production line

1. Control requirements:

(1) Set the system to automatic operation mode through the switch. Once started, the driving motor of the conveyor belt is started and kept until the switch stops or the sensor under the filling equipment detects the bottle; After the bottle is full of drinks, the conveyor belt drive motor must be automatically started and held until another bottle is detected or the switch stops.

(2) When the bottle is under the filling equipment, stop 1s and the filling equipment starts to work. The filling process lasts for 5s, and the filling process should have alarm display. After 5s, it stops and no alarm will be displayed. The alarm mode is that the red light flashes every 0.5s.

(3) Use two sensors and several adders to detect and record the number of empty bottles and full bottles. Once the system is started, the number of empty bottles and full bottles must be recorded, with a maximum of 99,999,999 bottles.

(4) The counter can be reset manually.

2. Programming and debugging

3. Draw the I/O terminal wiring diagram

2. Design and debugging of ladder diagram control program for elevator floor positioning and decimal display in12 floor.

1. Control requirements:

(1) Determine the floor where the car is located according to the state of the travel switch on each floor.

(2) Use two seven-segment LED digital tubes to display the positions of two decimal floors (note: if the output points are not enough, two internal relays can be used).

(3) 00 is used to maintain the display, which can be turned off manually.

2. Programming and debugging

3. Seven-segment code coding schematic diagram, truth table and I/O terminal wiring diagram

3. Design and debugging of ladder diagram control program of water pump in property water supply system.

There are 4 water pumps in the water supply system of a property, and pressure detection switches K 1, K2 and K3 are installed on the water supply pipeline. K 1 on, indicating low water pressure; K2 is connected, indicating that the water pressure is normal; K3 is connected, indicating high water pressure.

1. Control requirements:

(1) When working automatically, the water consumption is less, and when the pressure increases, K3 is connected. At this time, the 1 pump can be removed after a delay of 30s, and the pump that works first is required to be powered off first; When the water consumption is too large, the pressure decreases and K 1 is turned on. At this point, 1 pump can be delayed for 30 seconds before joining the work, requiring the pump that has never worked to be put into operation; K2 is connected, indicating that the water supply is normal and the pump operation can be maintained. When working, the minimum number of water pumps is required 1 and the maximum number is 4.

(2) When each water pump is working, it should have working status display.

(3) When working manually, it is required that four pumps can run independently (with start and stop switches respectively) and have overload protection respectively, so that a single pump can be powered off at any time (Note: if there are not enough input points, one overload protection input can be reduced).

(4) Set the "automatic/manual" switch (on- manual, off- automatic) and set the automatic operation control switch (on- automatic operation, off- automatic operation stop).

2. Draw the operation block diagram, I/O address, program and debugging.

3. Draw the I/O terminal wiring diagram.

Fourth, design the topic by yourself

Requirements: Design the PLC ladder diagram control topic and program of the auto-cleaning device.

(1) Understand the automatic car cleaning process.

(2) Design topic: title, control requirements, working block diagram or sequence diagram, I/O addressing.

(3) Programming and debugging

(4)I/O terminal wiring diagram

V. Complete the course design description

1. Subject name and requirements

2. Procedures (including notes), block diagram and I/O wiring diagram

3. Relevant instructions and debugging summary, etc.

4. Course design experience