IC697VAL314
IC697VAL314
IC697VAL314通过通讯协议格式建立主机和变频器之间的相互访问,达到控制变频器的目的。
四、通讯方式1)上位机为主机,主机可为计算机、PLC可编程控制器等,变频器为从机。采用主机轮询,从机应答的点对点通讯方式。主机广播时,从机不允许应答。
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2)利用键盘设定变频器串行接口通讯参数,包括本机地址(从站地址),波特率,串行接口地址等。3)为保证半双工的可靠工作,发送数据帧与接收数据帧之间时间间隔应不小于5ms,数据帧的字节之间的时间,间隔应不小于1ms。
五、通讯出错
通讯时,若出现校验和错误或数据超出范围,从机变频器将发送报错数据包,并准备接收下一帧数据。
六、协议数据包格式格式
发送顺序
定义 头地址区状态区命令区代码区数据区校验尾
发送字节 1 2 2 2 2 4 21
注意:除去数据包头和数据包尾其他数据都要转化为ASCⅡ码。字节计算方法是除去数据包头和数据包尾各算一个字节,其他数据都要转化为ASCⅡ码后‚一个ASCⅡ码表示一个字节。例如:1号从机地址为01H,则高位ASCⅡ码30H,低位ASCⅡ码31H。共两个字节。
七、协议格式解释(以下提到的D99,D100,D101,D102等数据都是PLC中的地址)
1)数据包头=7EH
数据包的起始字节,不用转换为ASCⅡ码,记为一个字节。
2)D99=从机地址
数据含义:变频器为从机,变频器的本机地址即为从机地址。
发送方式:将从机地址的高4位和低4位拆分并转换为ASCⅡ码,先高后低发送。
例如:1号从机地址为01H,则高位ASCⅡ码30H,低位ASCⅡ码31H。共两个字节。先发送30H,再发送31H共两个字节,其他字节的发送方式与此一致。
3)状态代码(编程时发送包里状态码永远置为00H,而接收包里为其他的6个状态码,具体是哪个要看是变频器所处的状态)
IC697VAL314
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