AB 1747-L541 plcAB 1747-L541 plcAB 1747-L541 plc
问题反映：PLC到TP270直线距离大概有20米，通讯线放电缆槽沟内长度大约有35米，PLC柜紧挨着直流传动柜，直流传动柜旁边是低压柜(内有液压站电机、主电机风机的接触器、保护器，低压开关、微断等，还有几台变频器)，所有的电缆都在一个电缆沟里，有较大部分的平行放置；变频器与直流传动均没有与PLC实现网络通信，所有的运行指令及速度值由PLC输出，PLC通过电缆与相关设备连接。
解决方案：变频器和TP通信线是否有屏蔽？变频器的布线和屏蔽如果处理得不好的话，可能会产生很重的干扰。
是否可以试试将TP暂时放PLC旁边，或者临时拉一条通信电缆（不要放电缆沟）。如果没问题的话，说明是干扰的问题。
问题反映：变频器功率不大，5.5Kw，但是变频器与TP没有通讯。PLC与TP通讯电缆是西门子电缆，屏蔽层接数据地线，但这根电缆与多根大电流的电缆平行放置，长度大约15米．
已经将TP放在PLC旁边，没有任何问题的，今天准备更换一根通讯电缆，而且远离动力电缆，不知是否有效果。PLC端的RS485总线插头的终端电阻不接，TP端的终端电阻接入。
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郑娟萍
厦门仲鑫航自动化设备有限公司
解决方案：如果只是PLC和TP的点对点通信，双方都应该接入终端电阻。
问题反映：采用了上次提出的方法，两端都接入终端电阻，但是还频繁地出通讯中断的提示，等大修时间在更换一下动力电缆再看看效果。
总结：通过实验，可以肯定干扰的根本原因是通信电缆与多根大电流的电缆（特别是变频器的输入、输出电缆）平行放置在同一电缆沟内，且距离很近。
这个系统比较简单，只是点对点通信，zui简单的实验方法就是将两台设备暂时放置在一起，或者临时拉一条通信电缆（不要放电缆沟）。如果干扰消失，肯定是电缆布线引入的干扰。可以用示波器观察RS-485的A、B线对数字地（5针）的波形，如果有强烈干扰，可以看得到干扰信号的波形。
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BROWNING Q1 2-3/16 SPLIT TAPER BUSHING, NIB
JAMESBURY ACTUATOR ST-200 B ESPE POSITIONER W/ 3" VALVE 5150313600MT
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FANUC SERIES 16 & 18 PARAMETER MANUAL GFZ-61810E/02
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GENERAL ELECTRIC CONTACTOR 600V 20A 3PHASE CR7RA
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FISHER VRC KIT REPAIR RV150XHDC22
ATLAS COPCO K256870B 442400F53TXD4PU CP53-02 USED
DYNAQUIP CONTROLS AP0503SR6, PNEUMATIC ACTUATOR, 142 PSI, 1/8" NPT, NIB
TRIUMPH 11208, JOBBER DRILL BIT, 1/8" SIZE, 1 5/8" FLUTE, LOT OF 12, NIB
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THOMAS & BETTS 2562 STRAIN RELIEF CORD CONNECTOR STRAIGHT, 1 1/2", NIB
BUSSMANN 400A 700V SEMITRON FUSE 170M3619
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ALLEN BRADLEY AUXILIARY CONTACT KIT WZ21134 102469
ROTOR TOOL N52LRA8 3/8" DRIVE ANGLE PNEUMATIC NUTRUNNER
