The DCS system should be comprehensively managed throughout the entire process from design, construction, commissioning, to operation and maintenance. As a system maintenance personnel, it is necessary to develop scientific and reasonable maintenance strategies and methods based on system configuration and production operation characteristics, strengthen system maintenance, analyze specific faults and problems that occur during operation, and promptly handle them to ensure stable and reliable operation of the DCS system. During unit maintenance, the DCS system should be thoroughly maintained, mainly including:
(1) Reset the DPU, CPU, operator station, and data station of the DCS system one by one during the maintenance time of the unit; Delete invalid I/O points in the configuration and optimize the configuration.
(2) System redundancy testing: Conduct redundancy testing on redundant power supplies, servers, controllers, and communication networks. Pay attention to whether the switching between master and slave devices, network, and human-machine interface stations are normal during power outages of various equipment in the system; After system maintenance and power on again, perform switching tests on each device.
(3) System dust removal: When the system is shut down, clean and blow dust on all equipment, including the host, control station cage, cabinet filter screen, fan, and other components.
(4) Grounding system maintenance. Including terminal inspection and ground resistance testing; Maintenance of system power supply lines and testing of UPS power supply capacity; Pay attention to checking the CMOS battery level of the DPU host to prevent CMOS data loss.
(5) Check the interfaces between the DCS system and other systems, handle important signal redundancy, and implement one-way transmission and firewall measures for communication with other systems.
(6) System power on: After the system overhaul, the maintenance responsible person confirms that the conditions are met and strictly follows the power on steps.