After the elevator is in position,

After the elevator is in position, it can open and close the door manually or automatically.(3) when the elevator stops at a certain floor and waits for passengers, press the external call button of the next floor to open the door automatically to welcome passengers.When the elevator has completed all instructions in the car and there is no external call signal, the elevator should be able to close automatically.Open door button. Press the "open" button on the control panel to open the elevator door during the opening and closing process or before the elevator starts after the door is closed.(7) the lobby on each floor is equipped with up and down call switches (the top floor is only equipped with up and down call switches, and the bottom floor is only equipped with up and down call switches).(8) the direction indicator and the current floor position indicator are installed inside and outside the elevator. There are two kinds of signs in the car and in the lobby on each floor. One is the direction indicator light, used to indicate the up and down running state;When there are multiple inner layer selection commands on the car control panel, the elevator should be able to stop automatically according to the floor order and automatically determine the direction of operation.When the floor selection instruction on the car control panel is different from the direction of the elevator, the elevator should be able to automatically determine the direction of the elevator according to the principle of preemption.The elevator should be able to remember the call signal outside the building during operation, and the elevator should be able to stop automatically one by one in response to the running direction of the call meeting.(13) the elevator is equipped with floor buttons, door opening and closing buttons, alarm bells, electric fans and lighting.The design of trapezoidal diagram can be divided into several steps, and then these steps are combined together to form a complete trapezoidal diagram.There are several situations when an elevator opens and closes:(3) the door opening when the elevator stops automatically.When the elevator is located on a certain floor, the indicator generates a floor signal to control the status of the indicator light.When leaving the floor, the floor signal shall be replaced by the new floor signal.Passengers or drivers can select the floor they want to go to through the operation of 1-6 layer selection buttons on the operation panel in the car.When the passenger or driver calls the elevator outside the hall door, the call signal shall be received and remembered.6. Start the acceleration and stable operation during automatic operationThese modules are programmed in sequence to form a complete ladder diagram.When the PLC control technology is applied to the function of the elevator control system, the following design work must be carried out: use the motor device to make the elevator car rise and fall smoothly, and set switches on each floor. Descending instruction: when the elevator is waiting for guests on the designated floor, the call button of the corresponding floor can be pressed. When the elevator reaches the floor, it opens its doors and waits for passengers to enter. When there is no next command, the elevator will automatically close the door; If the elevator receives multiple up and down instructions, it will be automatically processed according to the floor height and respond in the first time, so as to ensure the effectiveness of the entire operation process. Start the operation, call the ladder number, select the car operation. After reaching the selected level, after leveling the trolley, change the speed level, eliminate the floor selection signal, and complete the open and close operation. PLC program adopts modular design to realize the above functions, such as the registration and cancellation of internal and external instructions, automatic positioning, stratified selection, variable speed, vertical cutting ladder, floor number indication, etc.