四层电梯控制系统英文文献.pdf

Elevator Control System EET 275 Experiment #9 Instructor: Roger A. Kuntz Office: 174 REDC May 1, 2008 Richard Baker Mike Penfield Eric Williams Table of Contents: Executive Summary… ……………………………………………….3 Discussion of the Nine Step Process of Programming… ……………3 Modular Options…………………………………………………….4 Discussion of the Design… ………………………………………….5 Discussion of Teamwork… ………………………………………….10 Conclusion… ………………………………………………………...11 Wiring Schematic… …………………………………………………12 Program… …………………………………………………………..13 2 Executive Summary The purpose of this lab was to design and implement a three floor elevator control system. The system was implemented using the nine step procedure for programming PLCs from the EET 275 text book. Each floor was to have its own illuminated pushbutton to call the elevator to a demanded floor. The elevator door was to be simulated with the use of a 12VDC bench-top mounted motor that opened, stayed open, and reversed after ten seconds at each floor after being called. A 12VDC motor was used to hoist the elevator and IR sensors were used to indicate when the elevator was at the floor in position to open. The entire system included a master start-stop circuit to ensure that the operation could be completely shutdown for emergencies or repair. The final aspect of this experiment was to intelligently organize the ladder logic to make troubleshooting easier. To do this, all of the subroutine jumps were placed in the second ladder and the actual subroutines in its respective ladder. Discussion of the Nine Step Process of Programming The first step of the nine step procedure of programming PLCs is to define the process to be con