FBM241C P0916FH**FBM241C P0916FH

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FBM241CP0916FH
FBM241CP0916FH

1.通过对上位机和PLC之间的串行通信的方式以及接口标准的研究，确定了本控制系统中的通信子系统所使用的通信标准和接口。

2.通信协议是保证串行通信的稳定性和可靠性的重要环节。本章对上位机和SIMATIC S7-200系列PLC之间采用自定义通信协议的串行通信进行了研究，并对自定义通信协议中的重要指令的格式定义进行了详细的设计和分析。此外，还对通信程序的发送、接收、应答、BCC校验和数据维护子模块的设计进行了详细的分析。

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