1C31181G01 EMERSON

Before the signal is connected to the computer,a capacitor should be connected in parallel between the signal line and the ground to reduce the common mode interference;adding a filter between the two poles of the signal can reduce the differential mode interference.Due to the complexity of electromagnetic interference,it is impossible to eliminate the effect of interference at all.Therefore,in the software design and configuration of the DCS control system,anti-interference processing should be carried out in the software to further improve the reliability of the system.Some commonly used measures:digital filtering and power frequency shaping sampling,which can effectively eliminate periodic interference;regularly correct the reference point potential,and use dynamic zero point,which can effectively prevent potential drift;use information redundancy technology to design corresponding software flags;Use indirect jumps,set software traps,etc.to improve the reliability of the software structure.

信号在接入计算机前，在信号线与地间并接电容，以减少共模干扰；在信号两极间加装滤波器可减少差模干扰。由于电磁干扰的复杂性，要根本消除干扰影响是不可能的。因此，在DCS控制系统的软件设计和组态时，还应在软件方面进行抗干扰处理，进一步提高系统的可靠性。常用的一些措施：数字滤波和工频整形采样，可有效消除周期性干扰；定时校正参考点电位，并采用动态零点，可有效防止电位漂移；采用信息冗余技术，设计相应的软件标志位；采用间接跳转，设置软件陷阱等提高软件结构的可靠性。