How to reduce the failure rate of information system

The selection, design and debugging of 1DCS, and the configuration of 1 system and controller should focus on reliability and load rate (including redundancy). The communication load rate must be controlled within a reasonable range, and the load rate of the controller should be as balanced as possible to avoid the problem of "high load". 2 The distribution of system control logic should not be excessively concentrated on one controller, and the main controller should adopt redundant configuration. 3 Power supply design must be reasonable and reliable. Pay attention to the load rate of power supply design and the redundant configuration of power supply to ensure two independent power supplies. Pay attention to the reliability of DCS system interface, and pay attention to the interface mode and redundancy of important interfaces. The grounding of 5DCS system should be carried out according to the requirements of the manufacturer to avoid large-scale system failure caused by grounding problems. Attention should be paid to the anti-interference measures of the system, and isolation measures should be emphasized in I/O channels. Pay attention to cable quality and shielding, and use computer-specific communication shielded cable for important signals and control. 6 According to the operation characteristics of the equipment and the requirements of the unit to deal with emergency failures under various working conditions, the operator station and standby manual operation devices are configured. The emergency stop button configuration shall adopt a separate operation loop independent of DCS. 7 For the protection system, multi-channel signal acquisition method is adopted. Reasonable use of locking conditions makes the signal loop have the ability of logical judgment. During debugging, all logic, circuits and working conditions should be tested according to the debugging outline and methods to ensure that all parameters are set correctly and reasonably. 2DCS operation, start-stop maintenance 1 Prepare for maintenance. The maintenance of DCS system should make the following preparations: (1) Maintenance personnel should be familiar with the structure and functional composition of DCS system, know the hardware knowledge of system equipment and master the DCS configuration software skillfully. (2) System backup: including operating system, control system software and logic configuration, to ensure data integrity and up-to-date. Mainly CD-ROM, using mobile hard disk, USB flash drive, etc. To ensure a dedicated disk. (3) Hardware storage: properly back up the easily damaged and short-lived components and key components, ensure that the spare parts of various cards and modules are not less than 1, and store them according to the requirements of manufacturers. Check spare parts if possible. (4) Arrange the after-sales service scope and timetable of products, and form the technical support address book of DCS manufacturers and design and debugging units. 2 The daily maintenance of the daily maintenance system is the basis for the stable operation of DCS, which mainly includes the following points: (1) Improve the DCS system management system according to the requirements of 25 countermeasures and DL/T774 maintenance regulations and other documents. (2) The electronic room is well sealed to ensure that the temperature, humidity and air cleanliness meet the requirements of the manufacturer. The ambient temperature signal between electronics can be introduced into DCS monitoring. (3) Check whether the fans in each cabinet of the system work normally and whether the air duct is blocked every day. (4) Ensure the power supply quality of the system, provide reliable power supply for two power sources, and give an alarm when any power source loses power. (5) It is forbidden to use wireless communication tools in the electronic room, so as to avoid the interference of electromagnetic fields on the system, and avoid pulling or colliding with equipment connection cables and communication cables. (6) Standardize the management of DCS system software and application software. Software modification, update and upgrade must comply with the system of examination and approval authorization and responsible person. Do a good job in the closed management of host USB port and CD-ROM drive. (7) Record system data such as PID parameters of each control loop and positive and negative effects of regulators. (8) Check whether the control host, monitor, mouse, keyboard and other hardware are in good condition and the picture is normal. Check the troubleshooting screen to see if there is a fault prompt. (9) The power-up of DCS equipment including DPU and man-machine interface station shall be carried out one by one in a certain order. After each equipment is powered up and observed to be normal, the next equipment operation shall be carried out. (10) Periodically test the communication load rate of the DCS main system and all related systems connected with the main system. Check the status of redundant master-slave devices, and switch the master-slave devices regularly or when conditions permit. (1 1) Describe important configuration pages in Chinese; Compile the test operation card and ensure that it is updated at any time. Standardize DCS configuration operation, and try not to make big configuration modification during operation. (12) Restart all the man-machine interface stations one by one on a regular basis (it is recommended to take about 2 or 3 months) to eliminate the accumulated errors caused by long-term operation of computers. 3. The DCS system should be thoroughly maintained when the unit is overhauled, which mainly includes: (1) resetting the DPU, CPU, operator station and data station of the DCS system one by one by using the unit overhaul time; Delete invalid I/O points in the configuration and optimize the configuration. (2) System redundancy test: test the redundant power supply, server, controller and communication network. Pay attention to whether the master-slave equipment switching, network and man-machine interface station are normal when the system equipment is powered off; After the system is overhauled and re-energized, the equipment is switched and tested.