SCHNEIDER 140DDI35300 施耐德/昆腾系列CPU 控制模块备件

SCHNEIDER 140DDI35300 施耐德/昆腾系列CPU 控制模块备件

SCHNEIDER 140DDI35300 施耐德/昆腾系列CPU 控制模块备件

与PLC控制器控制系统连接的各类信号传输线，除了传输有效的各类信息之外，总会有外部干扰信号侵入。

此干扰主要有两种途径:一是通过变送器供电电源或共用信号仪表的供电电源串入的电网干扰，这往往被忽视;

二是信号线受空间电磁辐射感应的干扰，即信号线上的外部感应干扰，这是很严重的。由信号引入干扰会引起I/O信号工作异常和测量精度大大降低，严重时将引起元器件损伤。对于隔离性能差的系统，还将导致信号间互相干扰，引起共地系统总线回流，造成逻辑数据变化、误动和死机。PLC控制器控制系统因信号引入干扰造成I/O模件损坏数相当严重，由此引起系统故障的情况也很多。

接地是提高电子设备电磁兼容性(EMC)的有效手段之一。正确的接地，既能电磁干扰的影响，又能设备向外发出干扰;而错误的接地，反而会引入严重的干扰信号，使PLC系统将无法正常工作。

All kinds of signal transmission lines connected with the PLC controller control system, in addition to the effective transmission of all kinds of information, there will always be external interference signal intrusion.

There are two main ways of this interference: one is through the transmitter power supply or the power supply of the shared signal instrument into the grid interference, which is often ignored;

Second, the signal line is interfered by electromagnetic radiation induction in space, that is, the external induction interference on the signal line, which is very serious. The interference introduced by the signal will cause the abnormal work of the I/O signal and the measurement accuracy will be greatly reduced, and the components will be damaged in serious cases. For the system with poor isolation performance, the signals will interfere with each other, causing the bus backflow of the common ground system, resulting in logical data changes, misoperation and crash. PLC controller control system due to signal interference caused by I/O module damage is quite serious, resulting in a lot of system failures.

Grounding is one of the effective means to improve electromagnetic compatibility (EMC) of electronic equipment. The correct grounding can not only affect the electromagnetic interference, but also the equipment can send out interference; The wrong grounding will introduce serious interference signals, so that the PLC system will not work normally.