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The Integrated Turbine Control System ITCC provides centralized and integrated monitoring and control for the compressor unit, covering functions such as turbine speed regulation, overspeed protection, anti-surge control, load distribution control, performance control, monitoring of shaft displacement/vibration/axle temperature, monitoring of operating parameters for main and auxiliary equipment, as well as the unit’s self-protection interlock logic. And achieve communication with the DCS. The system requirements are as follows: 1) For the control systems related to the unit control system, it should adopt a TMR triple-redundancy hardware architecture; the system’s safety level and reliability must be certified at SIL3 and TUV6 levels, in compliance with the IEC61508 standard. The system’s availability is not less than 99.99%. The system CPU load should not exceed 50%. 2) The integrated control system of the unit enables functional control, allowing for the regulation of the turbine speed as well as overspeed protection ； Suffocation prevention control, load distribution control, overall performance control, interlock protection for the compressor unit, monitoring of shaft displacement/vibration/axial temperature, as well as operational parameters of the main and auxiliary units, are all integrated within a comprehensive control system, thereby ensuring high reliability and availability in the operation of the compressor unit. The system should be designed to be fault-safe in the event of power failures; when a fault occurs, the system shall shut down in a fault-safe manner ； The system should have unified and comprehensive hardware and software fault diagnosis as well as self-diagnosis functions; it should automatically record fault alerts and notify maintenance personnel to carry out repairs ； Various cards in the system should be able to be inserted and removed online. The unit control system station should have a hardware interface with the SOE station; the system scanning speed should be less than 50 ms, and it should possess an event fault alarm function (SOE) to enable timely recording of every fault within the system or in the process, as well as any factors that cause the process to stop, in accordance with the actual time of occurrence. The unit control system should be able to perform online inspections of the unit without shutting it down. These facilities should be able to monitor the status of the compressors and auxiliary equipment, and provide basic online information at regular intervals ； Such as pressure, temperature, flow rate, vibration, and lubricant conditions, etc. 3) System hardware: A unified and complete set of system hardware is required; all functions related to unit control should be carried out within this same hardware setup, thereby ensuring seamless system control. The main processor and I/O cards feature triple-redundancy fault tolerance, supporting a 3-2-1-0 operation mode to maximize the availability and reliability of the control system. All the provided hardware must have TUV AK6 certification. All I/O cards should be isolated, with isolation between inputs, outputs, channels, and power supplies. The I/O cards are capable of detecting open circuits or short circuits in the field wiring and issuing alarms accordingly. The DI card input and DO card output can withstand overvoltages of 220VAC, 50Hz. Each channel of the AI card has an independent A/D converter. The unit control system supplies power to the 24V electrical instruments on site; where the I/O cards cannot provide power, power supplies and distribution terminals are installed. l This technical appendix provides detailed technical information and specifications regarding the wiring of the I/O cards as well as their interface circuits. This technical attachment provides details on the technical specifications of the I/O cards, such as conversion accuracy, input impedance, load capacity, and interference resistance; relevant information is available in the detailed specification sheets for each card listed in the attachment, as well as in the circuit diagrams of the card interfaces. I/O card isolation methods: point-to-point isolation, optoelectronic isolation between DI/DO points and the field, and coupling isolation between AI points and the field. 4) Communication interface: The unit control system must be equipped with redundant communication cards to facilitate data communication with other systems of the device. 5) Operating environment and related requirements: Temperate continental climate with a continentality index of 75%; dry with little rainfall, cold winters and hot summers, large temperature differences between day and night. The average annual sunshine duration is about 3,000 hours, the average annual temperature ranges from 6.1 to 7.1°C, and the frost-free period lasts 135–150 days. Experience driving successfully in high-altitude areas. In particular, it should be suitable for a driving environment similar to that of this project. 6) Performance: Experience in commissioning 3 or more similar air separation units is required, along with copies of the relevant contracts for those commissioned projects.