2 取值算法2.1 取值因素2.1.1因素分析缺省值分析的难点就是取值

2 Value Algorithms <br>2.1 Value Factors <br>2.1.1 Factor Analysis <br>The difficulty of default value analysis is the problem of value selection, especially for some default values ​​that are difficult to obtain. From the three dimensions of the default value (a, the difficulty of the signal failure being monitored and discovered by the operator in time; b, the degree of influence on the system after various default values ​​are excited; c, the redundancy degree of the signal function. ), through the scores of these three factors, the default value score is obtained through the default value algorithm, and the default value is obtained by comparing with the value table. <br>The degree of consistency between the state of the controlled device and its fail-safe state after the signal default value is activated is a verification and judgment factor for the rationality of the value after the default value is selected, and this factor is also related to the selection of different default values. , such as the default value taken during analysis, which can cause the state of the controlled equipment to be consistent with its fail-safe position, or it can be inconsistent. Whether it is reasonable is determined according to whether the state caused by the final default value is consistent. If the state is inconsistent, it should be a non-conservative value. If the total score falls in the non-conservative area, the analysis can be considered reasonable. , if not, it is necessary to comprehensively consider relevant factors again, and artificially determine its rationality. <br>In the analysis, different default values ​​are taken and the value judgment factor is related to the difficulty of failure monitoring and the score of the failure impact degree. If different default values ​​are taken, the difficulty of failure monitoring and the score of the failure impact degree will be different. , for example, taking the default value of triggering an alarm, the score of its failure monitoring is smaller than that of not triggering an alarm. <br>The score of the redundancy degree of the signal function has nothing to do with the value of the default value in the analysis. Taking any default value, the redundancy degree score of the signal function remains unchanged, and is only related to the design of the signal and function.

2 value selection algorithm<br>2.1 value factors<br>2.1.1 factor analysis<br>The difficulty of default value analysis is the value problem, especially for some default values that are difficult to obtain. From the three dimensions of default values (A. the difficulty of signal failure being monitored and found by operators in time. B. the impact on the system after various default values are activated. C. the redundancy of signal functions.), Through the scores of these three factors, the default value score is obtained through the default value algorithm, and the default value is obtained by comparing with the value table.<br>The consistency between the state of the controlled equipment and its fail safe state after the signal default value is activated is a verification and judgment factor for the rationality of its value after taking the default value. This factor is also related to taking different default values. For example, the default value taken during analysis can lead to the consistency between the state of the controlled equipment and its fail safe position or inconsistency. Determine whether it is reasonable according to whether the state caused by the final default value is consistent. If the state is inconsistent, it should be a partial non conservative value. If the total score falls in the non conservative area, the analysis can be considered reasonable. If not, it is necessary to comprehensively consider relevant factors and artificially determine its rationality.<br>When analyzing, taking different default values is related to the difficulty of failure monitoring and the score of failure influence degree. If taking different default values, the difficulty of failure monitoring and the score of failure influence degree will be different. For example, taking the default value of activating alarm, the score of failure monitoring is smaller than that of not activating alarm.<br>The score of redundancy degree of signal function has nothing to do with the value of default value during analysis. If any default value is taken, the score of redundancy degree of signal function remains unchanged, which is only related to the design of this signal and function.

2 Value-taking algorithm 2.1 Value factors 2.1.1 factor analysis The difficulty of default value analysis is the problem of value selection, especially for some default values that are difficult to obtain. Three dimensions of the value from the default value (A, the difficulty of signal failure being monitored and found by operators in time. B, the influence degree of various default values on the system after excitation. C. Redundancy of signal function. ), through the scores of these three factors, the default value score is obtained through the default value algorithm, and the default value is obtained by comparing with the value table. The consistency between the state of the controlled equipment and its fail-safe state after the signal default value is excited is a factor to verify and judge the rationality of its value after taking the default value. This factor is also related to taking different default values. For example, the default value taken during analysis can lead to the consistency or inconsistency between the state of the controlled equipment and its fail-safe position. Whether it is reasonable or not is judged according to whether the state caused by the final default value is consistent or not. If the state is inconsistent, it should be a partial non-conservative value. If the total score falls in the non-conservative area, it can be considered that the analysis is reasonable. If not, it is necessary to comprehensively consider relevant factors again and artificially judge its rationality. When analyzing, choosing different default values is related to the difficulty of failure monitoring and the score of failure influence degree. If you choose different default values, the difficulty of failure monitoring and the score of failure influence degree will be different. For example, if you choose the default value of triggering alarm, the score of failure monitoring will be smaller than that of not triggering alarm. The redundancy score of the signal function has nothing to do with the default value in the analysis. If any default value is taken, the redundancy score of the signal function will remain unchanged, only related to the design of the signal and function.