图尔克 BI2-G12-AN6X

图尔克 BI2-G12-AN6X

图尔克 BI2-G12-AN6X

公司名称：中海德（福建）工业设备有限公司

ZHONG HAI DE(FUJIAN)INDUSTRIALE QUIPMENT CO.，LTD.

姓名：陈顺真

座机：0591-83566917

手机：18005006971

QQ:2851617312

EMAIL：2851617312@qq.com

地址：福州市自贸区江滨东大道68-1号蓝波湾17层

 

2、PLC硬件故障

PLC的硬件故障较为直观地就能发现，维修的基本方法就是更换模块。根据故障指示灯和故障现象判断故障模块是检修的关键，盲目的更换会带来不必要的损失。

1）电源模块故障

一个工作正常的电源模块，其上面的工作指示灯如“AC”、“24VDC”、“5VDC”、“BATT”等应该是绿色长亮的，哪一个灯的颜色发生了变化或闪烁或熄灭就表示那一部分的电源有问题。“AC”灯表示PLC的交流总电源，“AC”灯不亮时多半无工作电源，整个PLC停止。这时就应该检查电源保险丝是否熔断，更换熔丝是应用同规格同型号的保险丝，无同型号的进口熔丝时要用电流相同的快速熔丝代替。如重复烧保险丝说明电路板短路或损坏，更换整个电源。“5VDC”、“24VDC”灯熄灭表示无相应的直流电源输出，当电源偏差超出正常值5%时指示灯闪烁，此时虽然PLC仍能工作，但应引起重视，必要时停机检修。“BATT”变色灯是后备电源指示灯，绿色正常，黄色电量低，红色故障。黄灯亮时就应该更换后备电池，手册规定两到三年更换锂电池一次，当红灯亮时表示后备电源系统故障，也需要更换整个模块。

2）I/O模块故障

输入模块一般由光电耦合电路组成；输出模块根据型号不同有继电输出、晶体管输出、光电输出等。每一点输入输出都有相应的发光二极管指示。有输入信号但该点不亮或确定有输出但输出灯不亮时就应该怀疑I/O模块有故障。输入和输出模块有6到24个点，如果只是因为一个点的损坏就更换整个模块在经济上不合算。通常的做法是找备用点替代，然后在程序中更改相应的地址。但要注意，程序较大时查找具体地址有困难。特别强调的是，无论是更换输入模块还是更换输出模块，都要在PLC断电的情况下进行，S5带电插拔模块是绝对不允许的。

3）CPU模块故障

通用型S5PLC的CPU模块上往往包括有通信接口、EPROM插槽、运行开关等，故障的隐蔽性更大，因为更换CPU模块的费用很大，所以对它的故障分析、判断要尤为仔细。

检修实例：一台PLC合上电源时无法将开关拨到RUN状态，错误指示灯先闪烁后常亮，断电复位后故障依旧，更换CPU模块后运行正常。在进行芯片级维修时更换了CPU但故障灯仍然不停闪烁，至到更换了通信借口板后功能才恢复正常。

3、外围线路故障

据有关文献报道，在PLC控制系统中出现的故障率为：CPU及存储器占5%，I/O模块占15%，传感器及开关占45%，执行器占30%，接线等其他方面占5%，可见80%以上的故障出现在外围线路。外围线路由现场输入信号（如按钮开关、选择开关、接近开关及一些传感器输出的开关量、继电器输出触点或模数转换器转换的模拟量等）和现场输出信号（电磁阀、继电器、接触器、电机等），以及导线和接线端子等组成。接线松动、元器件损坏、机械故障、干扰等均可引起外围电路故障，排查时要仔细，替换的元器件要选用性能可靠安全系数高的优质器件。一些功能强大的控制系统采用故障代码表表示故障，对故障的分析排除带来极大便利，应好好利用。

总结：西门子PLC其他系列的故障判断和处理方法与此原理相同可依次类推。上海彩亚电路板维修有限公司提醒：任何芯片级精密设备遇到故障时，在没有十足把握情况下，一定要请专业的技术服务企业予以处理，擅自改动程序和维修紧密设备电路板可能会造成设备维修难度加大甚至报废的严重后果。

 

 

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