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1. Routine inspections 1) Strengthen the training of system maintenance personnel. If the maintenance personnel are motivated, they will carry out the maintenance. 2) Conduct daily inspections of the system’s operation and keep records to identify patterns in system failures. For targeted maintenance. 3) The daily checks of system temperature and humidity changes should meet the system’s operational requirements. Check the operation of the system’s supply voltage, backup power supply, and DC power supply. Check the operating status indicated by the LEDs on the input and output cards. Check the operating status of the communication network. Check whether the redundancy status is normal. 4) Check the alarm interlock records to see if there are any abnormal entries, etc. For daily maintenance, it is necessary to avoid randomly pulling cables or damaging them or the network cables, especially at the connection points of the cables, to prevent loose connections and poor contact. 2. System maintenance: After a power outage, thoroughly clean the interior components, control station, and power supply units of the system to remove dust. Clean the dust filters in the control cabinet, etc. Inspect the system power supply circuits, terminal connections, safety barriers, etc., to ensure that the wiring is proper and reliable. Conduct a thorough inspection of the system grounding wires to ensure they are secure and reliable. The ground resistance meets the design requirements. Test the power supply performance to ensure it meets the requirements for normal operation. Test the line insulation, replace components that cannot be replaced while the system is in normal operation, and address any defects or shortcomings identified during operation that cannot be fixed at that time. Restore various markers. Inspect and calibrate the on-site instruments. Conduct comprehensive maintenance and inspection of transmitters, control valves, etc. Replace the damaged wires. Inspect and maintain the air supply for the regulator. Inspect and replace the air supply pipeline. Clean the filter. Check the signal wires to ensure a secure connection. Signal transmission is normal. Conduct a comprehensive inspection of signal alarms and signal interlocks to ensure they meet the process requirements. Check and record the set parameters. Simulate experiments on chained electricity. In short, a comprehensive inspection and maintenance of the system are necessary. After a comprehensive system maintenance. Power supply must be carried out in accordance with the requirements: (1) Supply power from the main power source. Power supplied to the control station, power supplied to the operation station. First, check the 220-volt AC supply at the control station, as well as the UPS output voltage; examine the power supply unit and the power distribution for the cards. The operation station consists sequentially of a display and an industrial computer powered on. After the self-check, the computer determines whether the system software files are correct. The hard drive files should remain unchanged. The card and network system indicator lights show no faults. (2) Conduct redundancy testing on the card components, (3) conduct redundancy testing on network communication; after the system is properly debugged, carry out simulated operations on the control system. Check from the control station whether the signal output corresponds to the position of the control valve. Set the positive and negative actions according to the process requirements. Set the PID parameters according to those before shutdown. 3. Points to note for system maintenance: 1) During system maintenance, if one comes into contact with the integrated circuits on the system components or the solder joints of the components, static electricity damage may occur. Electrostatic damage includes damage to components, reduced performance, and shortened lifespan. To avoid damage caused by electrostatic charges during maintenance, the following points should be noted: 2) Anti-static measures must be taken before removing components. Such as wearing a well-grounded anti-static wrist strap or performing human body discharge. 3) The replaced or spare card components must be placed in anti-static sleeves; they must not be left lying around carelessly. 4) Do not touch the solder joints manually, and certainly do not handle the components on the card components. 5) After replacing the card, it should be confirmed that its attribute settings remain the same as before. Power distribution for the card insertion slot, jumper addresses, redundancy settings, etc. Take advantage of the major equipment overhauls to carry out planned, comprehensive system maintenance. Comprehensive and systematic maintenance must be carried out with power outage. The steps for shutting down the system are as follows: ； (1) Each control station sequentially exits the monitoring interface and the operating system, and turns off the power to the host and monitor. (2) Turn off the power supply of each control station’s power supply unit one by one. (3) Turn off the UPS switch. (4) Turn off the main power switch ；