在多點(diǎn)配置中，上位機(jī)裝置作為主控裝置進(jìn)行配置，而一一個(gè)或多個(gè)PLC作為從屬裝置進(jìn)行配置。當(dāng)主控裝置和任何–個(gè)從屬裝置之間的最大距離不超過4000英尺(1200米)時(shí)，可以采用多點(diǎn)連接法，本圖假設(shè)采用質(zhì)量良好的電纜，并處在中等“噪音”環(huán)境中。在“菊花鏈”或多點(diǎn)配置中，采用RS-422最多可以連接8臺(tái)從屬裝置。RS-422線路中可以包括信號(hào):交換線路，并且要按照“電纜和連接器規(guī)格”一節(jié)中的規(guī)定選用電線類型.

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