1769-OF8C

1769-OF8C

1769-OF8C

1769-OF8C

标准的MODBUS通讯帧格式为：“〈仆方地址〉〈功能码〉〈起始地址〉〈数据传送量〉〈校验码〉”。对于不同的设备具有不同的MODBUS地址；同一设备，不同数据类型（外部寄存器、内部寄存器、外部保持线圈、内部保持线圈等）具有不同的功能码；同一数据类型，读/写操作不同时，也具有不同的功能码。

　　因此，在考虑MODBUS协议通讯时，不能只看有多少个模拟量/数字量，而必须同时考虑：有多少个设备，每个设备的通讯模拟量/数字量数据有多少，数据是否双向传送，通讯速率为多少。综合考虑以上因数后，计算出需要多少个通讯处理器。

　　需要强调的是：Foxboro公司的硬件通讯产品COMM30与许多公司的硬件通讯方式通过采用插在工程师站/操作员站主板上的串口通讯卡实现不同，Foxboro公司的COMM30具有专用的CPU芯片，***于工程师站及操作员站运行，是控制网络中一个***的处理站，即使在工程师站/操作员站死机时仍能保证通讯的正常运行，这在参与控制的通讯（如与定排程控、吹灰程控等）中显的尤为重要。

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