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HIMA’s H41/51q system is a CPU quadruple structure (QMR), that is, the central control unit of the system has four microprocessors in total, and each two microprocessors are integrated on one CU module, and then two identical CUs The modules form a redundant central control unit. HIMA’s 1oo2D structure products have obtained AK6/SIL3 safety certification. The purpose of adopting double 1oo2D structure, that is, 2oo4D structure is to provide users with maximum practicality (availability), and its fault tolerance function makes any part of the system fail without affecting the normal operation of the system. Compared with the traditional triple structure, its fault-tolerant function is more complete. At present, the SIS with quadruple structure has become the mainstream trend in the research and development of new systems by various professional manufacturers.