(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.
(6) All operator stations should be restarted regularly to eliminate accumulated errors caused by long-term computer operation. Develop the habit of regularly backing up configuration software. After each update of the point directory, all files under the engineer station configuration installation directory should be copied to the corresponding directories of each operator station. Otherwise, damage to the engineer station may cause the system to be unable to update the point directory.
(7) The DCS control room should ensure appropriate temperature, humidity, and dust levels. Regular inspections of the working environment and ventilation conditions should be carried out to avoid hardware failures or accelerated hardware aging caused by poor ventilation and heat dissipation. Generally, soot blowing should be performed on the operator station and DPU station once a quarter.
Fifth, attention should be paid to preventive maintenance, that is, proactive maintenance should be carried out in a planned manner to ensure the stability of the system. Perform preventive maintenance on the system using each major overhaul to understand its operational status and eliminate potential faults. During the major overhaul, the DCS system should be thoroughly maintained, including:
(1) System power supply and grounding system maintenance and inspection. Regularly check the capacity and charging and discharging time of UPS batteries, and conduct grounding resistance tests on the grounding electrode.
(2) Regularly conduct redundancy testing on redundant power supplies, servers, controllers, communication networks, etc., as long as the process allows.
(3) Perform spot checks on system cards. Thoroughly inspect and organize to extend the lifespan of the equipment.
(4) Power outage maintenance for operation and control stations. Including dust cleaning of components such as computer interiors, control station cabinets, and power boxes.
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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