描述
PLC的输入与输出最好分开走线，开关量与模拟量也要分开敷设。模拟量信号的传送应采用屏蔽线，屏蔽层应一端或两端接地，接地电阻应小于屏蔽层电阻的1/10.
交流输出线和直流输出线不要用同一根电缆，输出线应尽量远离高压线和动力线，避免并行。
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National Instruments NI BNC-2080 Rev B2 002287
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National Instruments CB-50 / Phoenix Contacts FLKM-50
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