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在一种复杂的故障状态转移可维修PLC系统中运用马尔可夫对其硬件,软件和软/硬件接口列出正常或失效状态表,画出状态转移图,进行了可靠性分析.通过用新的方法计算得到了其定量计算公式,然后引入新的GO法对简化的PLC系统建立了GO图,进行了GO运算,推导出新的定量计算公式,比较这两个计算得出结果相一致,验证了该式子的正确性.最后用推倒出的定量计算公式对实际工程中的综合料厂里的PLC控制系统进行了可靠性分析.为提高PLC控制系统的可靠性设计,维护,分析提供了理论依据和新的方法.“,”In a complex fault state transition maintainability PLC system reliability use Markov models of its hardware,software and hardware / software,Listed the normal state or failure state table,painting chart state transition to interfaces analyzing ,have been calculated with the quantitative formula.Then use new GO method apoint to a simplify PLC system building a GO picture,carried out a new quantitative comparison and can see the two calculated likethe same,to verify its correctness.hen use GO methodology to Authenticating. And use this quantitative formula. to analysing Composite plant material of the PLC Control system reliability. It provided a theoretical basis basis and new method for relibility design of sofeware and hardware,maintenance and scientific managent in the PLCsystem.