9300-RADES9300-RADES
9300-RADES9300-RADES产品描述:
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本公司主要优势产品:
【美国,英维思 Invensys FOXBORO I\A系统, Triconex ESD系统】
【美国AB ..1756系列,1785系列,1746系列,1747系列,1771系列】
【瑞士ABB.. 机器人 DSQC系列,ABB Advant OCS,ABB Procontic PLC CPU】
【法国施耐德140*康昆腾系列处理器,内存卡,电源模块等。】
【德国西门子Siemens MOORE,S5,S7,6DD等】
【美国通用电气GE..IC693/IC697系列】
【美国Westinghouse(西屋):OVATION系统、WDPF系统】
【德国Bosch Rexroth(博世力士乐):Indramat,I/O模块,PLC控制器,驱动模
块等。】
【美国Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列】
整个系统中将计算机虚拟电梯模型和电梯控制器PLC有机连接起来的就是计算机和PLC的通讯程序。通讯协议就是定义的使计算机与PLC能够识别相互之间通讯数据的通讯格式。本系统中S7-200与计算机间的数据传输,是以“帧”为单位进行的。本系统采用定长的通讯帧,每一帧的格式为:
定义:
1).开始字符标志着通讯帧的开始,在本系统中被定义为ASCII码的"@"。
2).结束字符标志着通讯帧的结束,在本系统中被定义为ASCII码的"#"。
3).校验码为正文各数据的异或和,用两个字节的十六进制ASCII码表示。
计算机与PLC通信时,为了避免通信中的冲突,采用主从方式,即计算机为主机,PLC为从机。只有主机才有权主动发送请求报文(或称为请求帧),从机收到后进行校验,若校验正确,则返回响应报文。
4)通讯帧中的命令类型则反映主从机之间的通讯数据类型。命令类型用两个字符格式表示,定义CT表示控制字,ST表示状态字,RS表示响应字。对不同命令类型的通讯数据帧格式定义如下:
(1) 状态字为计算机传向PLC的数据,表明虚拟电梯的状态及呼叫命令。该通讯帧数据格式为:
正文数据包括: 电梯的运行状态(上行、下行、停),安全信号(是、否),电梯开关门,电梯内呼外呼信号,平层信号等,用十进制数字按照下列定义的顺序表示:
运行方式定义为1位:自动为0,司机为1,检修为2,消防为3;
运行状态定义为1位: 电梯上行 为2,下行 1 ,停止为0,故障为3
电梯开关门定义为3位,*含义:按钮未按0,电梯开门1 ,电梯关门 2 ;二、三位表示门状态:开门过程00 ,开门到位01,关门过程10 ,关门到位11 ;
电梯内呼数据以N开始,以W结束,每两位表示内呼层数,如N0413W表示电梯内有到4层和13层的内内呼信号;
电梯外呼数据以内呼结束字符W位开始,以字符S为结束字符。每三位表示外呼层数:*是外呼方向0为下行,1为上行,2为上下均有呼叫,另两位表示层数。如数据W005112S则表示五层有下行呼叫,12层有上行呼叫。
平层信号用两位表示。
正文数据为A、B两梯的数据,其格式相同,其中A梯数据在前,B梯数据在后。
(2)响应字是计算机或PLC接收到数据后返回发送方的的响应。用于判断通讯数据是否正确。正文包括:当异或校验码正确时用00表示,错误时用11表示。当计算机向PLC发送如前所示状态字后,由PLC返回计算机的响应为:
(3)当计算机向PLC发送的数据格式为
表明计算机作为主机,要求PLC传送数据,主机处于数据接收状态,此时PLC向计算机传送的数据帧称为控制字,通过它来控制虚拟电梯的运行,控制字格式为
正文数据包括:电梯的上行下行停止,电梯开关门指令,信号指示(内呼、外呼、搂层)。定义格式与状态字类似。
3 .通讯程序设计
通讯程序的设计就是要在计算机和PLC之间完成以上述协议为格式的数据传递任务。分为计算机通讯程序和PLC通讯程序。
3.1计算机通讯程序
在开发计算机串行通信程序时采用VB编程语言,主要是利用MSComm (Microsoft Comm Control 6.0)通信控件,该控件提供了对串口的各种操作。MSComm提供两种通信方式,事件驱动方法和查询法。本系统采用查询法,查询法适合于较小的应用程序,每当应用程序执行完某一串行口操作后,将不断检查MSComm控件的CommEvent属性,以检查执行结果或检查某一事件是否发生。MSComm 控件主要属性有:
(1)Commport属性,设置并返回通信端口号,用于使用PC机的哪一个串行端口
(2)Setting属性,以字符串的形式设置并返回波特率、奇偶校验、数据位和停止位。
(3)Portopen属性,设置并返回通信端口的状态,用于打开或关闭端口。
(4)Output属性,用于发送数据,可以是文本数据或二进制数据。
(5)Input属性,从接收缓冲区返回和删除字符,用于接收数据。
(6) InputLen,设置并返回每次Input属性从接收缓冲区读取的字符数。
(7) CommEvent,返回zui近的通讯事件或错误。
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