文档介绍：摘要
本系统是一个十字路口交通灯的PLC控制系统,利用西门子公司的S7-200可编程逻辑控制器对十字路口的交通灯进行控制。本系统具有一定的智能性,即它可以对交通灯按高峰期、正常期晚间几个时段进行分段控制。
本系统采用主程序调用子程序的设计方案,通过主程序计算比较当前时间,进而根据对时间段的判断和分析来调用子程序段。子程序段分别是正常时间段、高峰时间段和晚间时间段,它们分别和各自的时序图相对应,从而控制交通灯的信号。
其中主程序用到了我们没有学到或者很少用到的指令语句,比如:读实时时钟指令,设定实时时钟指令,递增指令,字节与整数间调整指令等等。子程序的内容我们就很熟悉了,它主要使用了定时器,触点和输出线圈,这些都很容易明白。
这次以“多时段十字路口交通信号灯PLC控制系统设计”为题目的课程设计方案基本满足控制要求,可以实现十字路口交通信号灯在控制。
关键词:逻辑控制;调用;时钟;定时器
Abstract
Programmable controller (Programmable Logical Controller) is referred to as a PC or PLC industrial control devices invented in the late 1960s. Nippon Electric Control Society had made a programmable controller define the programmable controller is the logical, sequential control, timing and counting, and arithmetic control procedures the form of a string mands stored to memory, and then according the stored contents of control, through the analog, digital, and other input and output member, and means for controlling the production equipment and production processes.
   PLC is based on the development puter technology and automatic control theory from both different from the puter is different from the puter control system, as a special form puter-controlled device, software architecture of the system architecture, hardware as well as I / O channels, and many other aspects of the user interface has its own peculiarities.
   On MCGS (Monitor and Control Generated System u