Study notes (Tenth week)

First, the system hardware interface definition1. Floor Hardware Interface

Each floor of the elevator has two buttons "upstream" and "downstream" (the first layer and the seventh layer respectively only "upstream" and "downlink"), two led digital tube respectively shows about two elevators located on the floor, Arrow LED lights indicate the elevator running state (up, down, stop). The two buttons are electrical switches that control the uplink and downlink of the elevator.

2. Elevator internal Interface

The elevator car has a total of 7 digital buttons from "1" to "7" to select the destination floor, with an LED on each button indicating that the layer is selected. A LED digital display of the current floor, there are "open" and "off" and "emergency Alarm" three buttons, and equipped with LED lights.

3. Other

Each elevator by an AC asynchronous Inverter motor and inverter control, PLC to the frequency converter to send three switching signals: forward, reverse, stop. The "Up" "Down" button outside the elevator and the target floor number inside the elevator can be seen as the input signal of the motor.

Second, the system function definition1. Human-Computer Interaction function

The elevator is a semi-automated device that requires a smooth interaction with passengers, and passengers need to check the desired floor. The upper and lower row buttons on the floor Control Panel, as well as the target floor number buttons in the elevator car, are available for this function.

2. Elevator operation function

The operating state of the elevator needs to be displayed in the floor panel and inside the elevator panel. Each floor of the elevator has two buttons "upstream" and "downlink", there are two led digital tube respectively shows the two elevators on the floor, the digital tube has an arrow LED lights indicating the elevator running state (up, down, stop). An LED digital tube in the elevator car shows the current floor. Elevators need a condition detection function: the detection of their current floor, the opening and closing state of the door, the speed of the motor and so on. When someone presses the uplink and downlink buttons on the floor, the elevator control system schedules an elevator to reach the passenger's floor as soon as possible. Elevator car in the floor after the delay of 2 seconds to open the elevator door, the elevator door opened after 10 seconds after the elevator door automatically closed, during this time if someone pressed the Close button immediately close the elevator door. In the elevator door close process, if someone in the outside press the same direction with the elevator button or someone in the car press the door button, the elevator door opened again, once the elevator door closed, then no longer respond to the button. The ability to make decisions can be done by program designers.

Third, software function module decomposition and inter-module interface definition

Software function module can be divided into power control module, display function module, detection function module. One of the signal sources of the Power control module is the detection function module, which is equivalent to feedback. The detection signal Processing module handles the status detection signal or the input signal from the passenger as an input port of the motor control signal, so the detection function module and the Display function module can be transmitted in two directions.

Study notes (Tenth week)