外文翻譯---基于plc電梯控制系統(tǒng)的設(shè)計(jì)與實(shí)踐

1、中文 中文 3765 3765 字附錄英文原文 英文原文2008 Workshop on Power Electronics and intelligent Transportation System Design and Practice of an Elevator Control System Based on PLCXiaoling Yang1,2,Qunxiong Zhu1,Hong Xu11 College of infor

2、mation Science and greatly affects the elevator’s running quality. Therefore, entrusted by an enterprise, we have improved electrical control system of a relay-controlled elevator in a residential building by using PLC

3、. The result showed that the reformed system is reliable in operation and easy for maintenance. The first step for the development of the elevator control is to define the basic requirements. informally, the elevators b

4、ehavior is defined as follows. (1) Running with a single elevator Generally, an elevator has three operation states: normal mode, fire-protection mode and maintenance mode. The maintenance mode has the highest priority.

5、Only the maintenance mode is canceled can the other operation modes be implemented. The next is fire-protection mode, the elevator must return to the bottom floor or base station immediately when the fire switch acts.

6、The elevator should turn to normal operation mode when the fire switch is reset. Under normal operation mode, the control system’s basic task is to command each elevator to move up or down, to stop or start and to open

7、 and close the door. But is has some constraints as follows: Each elevator has a set of 9 buttons on the car control panel, one for each floor. These buttons illuminate when they are pressed and cause the elevator to vis

8、it the corresponding floor. The illumination is canceled when the corresponding floor is visited by the elevator. Each floor, except the first and the top floor, has two buttons on the floor control panel, one to reques

9、t an up- elevator, one to request a down-elevator. These buttons illuminate when they are pressed. The illumination is canceled when an elevator visits the floor, then moves in the desired direction. The buttons on the c

10、ar control panel or the floor control panel are used to control the elevator’s motion. The elevator cannot pass a floor if a passenger wants to get off there. The elevator cannot stop at a floor unless someone wants to g

11、et off there. The elevator cannot change direction until it has served all onboard passengers traveling in the current direction, and a hall call cannot be served by a car going in the reverse direction. if an elevator h

12、as no requests, it remains at its current floor with its doors closed. (2) Parallel running with two elevators in this situation, there are two elevators to serve the building simultaneously. it runs at 7am to 9am and 5p

13、m to 7pm every day.When an elevator reaches a level, it will test if the stop is required or not. it will stop at this level when the stop is required. At the same time, to balance the number of stops, the operation of

14、 two elevators will follow a certain dispatching principle. An elevator doesn’t stop at a floor if another car is already stopping cooperation of its electric power driving system and logic control system. 3. Software

15、 design Due to the random nature of call time, call locations and the destination of passengers, the elevator control system is a typical real-time, random logic control system. Here we adopted collective selective co

16、ntrol method with siemens PLC S7-200 CPU226 and its extension modules. There are 46 input points and 46 output points in the system. The i/O points are showed in Tablei and Table 2. About software designing, we adopt th