BUS21-30/60-30-001

发布时间：2019-01-11 11:06:11点击率：0

所属行业：五金工业品-> 电子电工-> 配电装置、开关柜、照明箱
价格：￥1400
规格：BUS21-30/60-30-001
供货总量：1

21-30/60-30-001

种情况：PLC作Mod主站，Mod地址和PLC手册里的地址一致，例如作主站的S7-200的M_MSG指令用于向

《联系人；欧先生》
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Mod从站发送请求消息，和处理从站返回的响应消息。要读取从站（另一台S7-200）的I0.0开始的地址区时，它的输入参数Addr（Mod地址）为10001。S7-200从站保持寄存器的V区起始地址为VB200时，要读取从站VW200开始的V存储区时，保持寄存器的地址是40001。

第二种情况：PLC作从站，PLC不用管什么Mod地址，等着主站来读写它的地址区就是了。

主站的计算机软件（例如DCS或组态软件）的编程人员需要编写实现Mod通信的程序，首先需要确定ModRTU的报文结构。他们一般不熟悉PLC，因此PLC的编程人员往往需要和上位机软件的编程人员一起来讨论Mod的报文结构。

容易出问题的就是报文里Mod地址与PLC存储区地址的对应关系。曾经有工作人员做过的一个系统的上位机是专用的组态软件，通过分析GEPLC手册给出的CRC的循环异或计算实例每一步的中间数据，编写出了CRC计算的C语言程序。通过实验验证了Mod报文结构和CRC的计算的可行性。

S7PLC手册给出的Mod地址与Modicon公司和GE公司PLC使用的地址相同，是基于1的地址，即同类元件的首地址为1。而西门子PLC采用的是基于0的地址，即同类元件的首地址为0。Mod报文中西门子PLC的Mod地址也采用基于0的地址。

PLC系统手册中的Mod地址的位用来表示地址区的类型，例如I0.0的Mod地址为10001。因为地址区类型的信息已经包含在报文的功能码中了，报文中S7-200的I0.0的Mod地址不是10001，而是0。报文中其他地址区的Mod地址也应按相同的原则处理。例如当S7-200从站保持寄存器的V区起始地址为VB200时，VW200对应的保持寄存器在报文中的Mod地址为0，而不是40001。

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