PLC的输入与输出**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。
4. PLC基本单元与扩展单元以及功能模块的连接线缆应单独敷设,以防止外界信号的干扰。
5. 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。
1. 输入接线
(1)输入接线一般不要超过30米。但如果环境干扰较小,电压降不大时,输入接线可适当长些。
(2)输入/输出线不能用同一根电缆,输入/输出线要分开。
(3)尽可能采用常开触点形式连接到输入端,使编制的梯形图与继电器原理图一致,便于阅读。
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