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Fourthly, in daily DCS applications, attention should be paid to:
(1) Regularly inspect the power supply of the DCS system, and conduct regular switching experiments for redundant power supply systems. At the same time, regular switching checks should be conducted on the UPS power supply, and the battery should be discharged and charged regularly according to requirements. Regularly check whether the network connectors and connecting wires are secure, and whether the wiring terminals inside the control cabinet are secure and reliable. Regularly check whether the system fan is working properly and whether the air duct is blocked to ensure long-term reliable operation of the system. Regularly check the operation of control units, I/O modules, other modules, etc. Regularly check whether the grounding is firm and test whether the grounding resistance meets the requirements.
(2) Regularly check the workload of controllers, computers, etc., and pay attention to whether there is any increase. Regularly check the hard drive and delete fragmented files. Historical files are often archived and backed up by external devices.
(3) For the interfaces between the DCS system and other systems, it is recommended to install a virus firewall on the gateway station on the other system side and update the virus library in a timely manner. Simultaneously update operating system patches in a timely manner to improve system security
(4) In principle, no software or hardware changes will be made during runtime.
(5) All modifications to the DCS system, whether it is configuration software, system software, or file attributes, should be recorded in detail in the engineer station (logbook). After each configuration change, it is necessary to copy the main station to the secondary station.
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Firstly, attention must be paid to the engineering design and construction phase before DCS installation. It is difficult to retrofit the DCS after it is put into operation, such as lightning protection, grounding shielding, etc. Therefore, it is far better to take corresponding measures after problems occur than before. Reasonable grounding structure should be selected in design, such as using equipotential single point grounding method; During construction, the correct grounding connection method should be used in accordance with relevant standards and specifications.
Secondly, some issues discovered in applications should be promptly addressed on site. A more effective measure for electromagnetic interference problems is to cut off the propagation path between the interference source and DCS. If the control room adopts grid shielding, filter devices are installed on the signal cables to ensure that the wiring of signal cables and power cables follows corresponding standard specifications, and SPD devices are installed to prevent lightning surge invasion.
Thirdly, operations must be strictly carried out in accordance with regulations. For static electricity issues, it is necessary to strictly implement the reason for wearing an anti-static wrist strap when inserting and unplugging cards; Use dedicated anti-static bags to store spare parts such as boards and cards
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