本文在结合IEEE标准以及国内外的工程实践的基础上，对后备系统进行了深入地研究，给出了后备系统的定义、功能、工作原理、设计要求。

Based on IEEE standard and domestic and overseas engineering practice, the fallback system is studied in detail. The definition, function, operational principle and design specification are presented.

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系统可根据技术要求和用户的选择进行自定义配置，以适合用户的研究，也可在日后升级，使其包括全面的测量模式和选项。

Systems are custom configured with the technologies and options you require to fit your research and can also be upgraded at a later time to include a full complement of measurement modes and options.

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以是否满足性能指标要求为评判标准，研究了容错控制系统可靠性概念的内涵和定义。

The intension of concept of reliability and the definition of reliability are discussed according to whether the fault tolerant control system satisfies performance requirement.

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