DO3401 operator station is located in the central control room, with more advanced equipment and friendly human-machine interface to provide real-time data of the production process and historical data management, the host computer accepts the field alarm signals from the field station PLC system and operating status signals, operating status signals, and has a screen display, report printing, historical data and trend graph display functions, alarm functions also include sound and Alarm function also includes sound and alarm point alarm, alarm confirmation and elimination. Through the above real-time control and display, centralised operation, centralised monitoring and centralised management of the production process can be achieved.

DO3401 Although the PLC system from the beginning of the birth and continuous development to date, the design has taken into account the harsh working environment of the industrial production site, has a strong anti-interference ability, but the work site conditions are ever-changing, with the frequency converter, DC governor and other power electronic equipment is widely used, a variety of sources of interference is endless, for example, the PLC system of the field control station is the scene and the site of the Various motor startup control cabinets, frequency control cabinets, etc. arranged together in the production site electrical control room, that is, in the motor and electric power circuits and electrical equipment formed by the harsh electromagnetic environment, the signal interference is inevitable.

DO3401 for the electrical system, effective low resistance grounding connection can reduce the occurrence of short circuits or system faults when the risk of electric shock, but also allows the system to generate the interference current through the grounding conductor or grounding elimination, greatly reducing the impact of electromagnetic interference on the system or the emission of interference signals. Therefore, an effective and perfect grounding system is one of the important measures for PLC control system anti-electromagnetic interference.