1756-OF8

 1756-of8

1756-of8

　plc用存储逻辑代替接线逻辑，大大减少了控制设备外部的接线，使控制系统设计及建造的周期大为缩短，同时日常维护也变得容易起来，更重要的是使同一设备经过改变程序而改变生产过程成为可能。特别适合多品种、小批量的生产场合。

（2）安装与布线

　　动力线、控制线以及plc的电源线和i／o线应分别配线，隔离变压器与plc和i／o之间应采用双绞线连接。将plc的i／o线和大功率线分开走线，如必须在同一线槽内，分开捆扎交流线、直流线，若条件允许，分槽走线，这不仅能使其有尽可能大的空间距离，并能将干扰降到低限度。

　　plc应远离强干扰源如电焊机、大功率硅整流装置和大型动力设备，不能与高压电器安装在同一个开关柜内。在柜内plc应远离动力线（二者之间距离应大于200mm）。与plc装在同一个柜子内的电感性负载，如功率较大的继电器、接触器的线圈，应并联rc消弧电路。

　　plc的输入与输出采用分开走线，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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