PLC模块DSQC664
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面议
PLC模块DSQC664
PLC模块DSQC664
PLC模块DSQC664
使用PLC进行顺序控制时,CPU进行数据处理需要时间,存一定时间延迟,故较控制时应予以考虑。变频器运行中会产生较强电磁干扰,为PLC不变频器主电路断路器及开关器件等产生噪音而出现故障,将变频器与PLC相连接时应该注意以下几点:
(1)对PLC本身应按规定接线标准和接条件进行接,应注意避免和变频器使用共同接线,且接时使二者尽可能分开。
(2)当电源条件不太好时,应PLC电源模块及输入/输出模块电源线上接入噪音滤波器和降低噪音用变压器等。另外,若有必要,变频器一侧也应采取相应措施。
(3)当把变频器和PLC安装于同一操作柜中时,应尽可能使与变频器有关电线和与PLC有关电线分开。
(4)使用屏蔽线和双绞线达到提高噪音干扰水平。
PLC和变频器连接应用时,二者涉及到用弱电控制强电,应该注意连接时出现干扰,避免干扰造成变频器误动作,连接不当导致PLC或变频器损坏。
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