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style="display:none;">[甉|癄QPLC温度模块频繁烧坏Q发现真相原来出自这里]:PLC温度模块频繁烧坏Q发现真相,d处理Q!QEM231 RTD模块作ؓS7-200 型PLC 中的成员Q其可方便的与多U规格的热电M感器q接。用户可以通过DIP开x选择热电ȝcd、接U方?..</div><div class="brand_news_con"><p style="text-indent:2em;"> <br /> </p> <p style="text-indent:2em;"> PLC温度模块频繁烧坏Q发现真相,d处理Q!Q?</p> <p style="text-indent:2em;"> EM231 RTD模块作ؓS7-200 型PLC 中的成员Q其可方便的与多U规格的热电M感器q接。用户可以通过DIP开x选择热电ȝcd、接U方?、测量单位等Q具体相兌|大家可以参考相关的模块手册Q。之后将所采集到的温度模拟量信号通过EM231q行模数转换后传输给CPU模块QCPU模块与触摸屏通讯后,昄出相应的数据温度?</p> <p style="text-align:center;text-indent:2em;"> <img src="http://oss.cnelc.com/kindeditor/img/20201209/20201209135112_1810.png" alt="" /> </p> <p style="text-indent:2em;"> <br /> </p> <p style="text-indent:2em;"> 我们现场所采用的是PT100的热电阻传感器(三线ӞQ通过两芯的屏蔽电~连接到EM231模块。运行中出现触摸屏温度数据显C?***Q检查EM231模块24V甉|灯熄灭,但实际测量直?4V甉|正常Q排查ؓ模块损坏Q立x换备用模块,甉|灯及触摸屏数据显C正常,搞定收工?</p> <p style="text-indent:2em;"> 谁知三天后同L问题再次出现。难道接U有问题Q不可能模块质量会这么差Q一pd的怀疑涌上头Q只得再ơ一步步q行分检查,其它的模块都正常说明24V甉|正应该没问题Q此时怀疑是不是有外部异常电压信L入模块造成烧坏。只得外部入手,断开温度模块接线Q单独测量传感器信号Ӟ得电阻107Ƨ姆Q换温度在20度左叻I1度ؓ0.385Ƨ姆Q正常。将万用表打C?00V档,分别对地得温度信号U的交流电压?3V左右Q至此明了是外部电压窜入模块烧坏?</p> <p style="text-indent:2em;"> 而后仔细再反q来惻I原来用的三线制传感器Q而采用的是二芯的屏蔽늼U传输信号到模块Q三U传感器的接U其中一根用的是二芯U的屏蔽层来代替的,而本w电~的屏蔽层就是来屏蔽外界的干扰电压,相当于无端的l模块送来一个高的电压,造成模块烧坏?</p> <p style="text-align:center;text-indent:2em;"> <img src="http://oss.cnelc.com/kindeditor/img/20201209/20201209135217_5576.png" alt="" /> </p> <p style="text-align:center;text-indent:2em;"> <img src="http://oss.cnelc.com/kindeditor/img/20201209/20201209135236_9175.png" alt="" /> </p> <p style="text-indent:2em;"> <br /> </p> <p style="text-indent:2em;"> 后箋通过重新敯信号U,采用三芯的屏蔽电~,三根芯线作ؓ传感器接U,同时屏蔽层q行接地处理Q确保传输的信号不会受到q扰Q避免有感应电压H入模块内部。进行后l一周的观察q行E_Q温度数据显CZ切正常,故障得到d处理?</p> <p style="text-indent:2em;"> <br /> </p></div><div class="meneame"><span class="disabled">< </span><span class="current">1</span> <span class="disabled">> </span></div> 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