1) DCS systems are often rich in self-diagnostics. According to the alarm, the fault point can be found directly, and the maintenance result can also be verified by the elimination of the alarm.
2) Poor contact of the communication connector can cause communication failure. After confirming that the communication connector is not in good contact, you can use the tool to redo the connector; the communication line should be replaced in time.
3) A card fault light flashes or all data on the card is zero. The possible reason is that the configuration information is wrong, the card is in standby status, and the redundant terminal cable is not connected, the card itself fails, and the slot is faulty. There is no configuration information and so on.
4) When a certain production status is abnormal or alarms, we can find the instrument that reflects this status first, and then use the instrument to check the correctness of the signal one by one in the direction of the upward signal transmission until the fault is found.
5) When a large-scale hardware failure occurs, the greatest possible cause is the system failure caused by the inefficient maintenance of the DCS system environment. In addition to emergency spare parts replacement and system cleaning at that time, it is also necessary to contact the manufacturer in time. The manufacturer's professional technical support engineers further confirm and troubleshoot the problem.
For the maintenance of DCS systems, the key is to do prevention first. As a system maintenance personnel, we should formulate scientific, reasonable, and feasible maintenance strategies and methods according to the system configuration and production equipment control situation, so that preventive maintenance and daily Maintain close cooperation, carry out systematic, planned, and regular maintenance to ensure that the system operates well in the required environment for a long period of time, so that the production process is stable in control, stable in operation, and provides a reliable guarantee for achieving the goals of production and efficiency.
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