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【正文】 f 2 with diagnostics (1oo2D) calculation, which is based on FSIC1 and FSIC2. The flow of calculations is as follows: (1) Sci1=F ci1 (D1,D2,Ddi,Dfss) (2) Sci2=F ci2 (D1,D2,Ddi,Dfss) (3) FSICi=F2oo2 (Sci1, Sci2 ),(i=1,2) (4) SIC_OutPut=F1oo2D (FSIC1, FSIC2) Safety putation As interlocking system consists of a fixed set of task, the putational model of SIC is taskbased. In general, applications may conform to a timetriggered, eventtriggered or mixed putational model. Here the timetriggered mode is selected, tasks are executed cyclically. The consistency of puting states between the two units is the foundation of SIC for ensuring safety and credibility. As SIC works under a loosely coupled mode, it is different from that of dedicated hardwarecoupled puter. So a specialized synchronization algorithm is necessary for SIC. SIC can be considered as a multiprocessor distributed system, and its putational model is essentially based on data paring via high bus munication. First, an analytical approach is used to confirm the worstcase response time of each task. To guarantee the deadline of tasks that municate across the work, the access time and delay of munication medium is set to a fixed possible value. Moreover, the putational model must meets the real time requirements of railway interlocking system, within the system puting cycle, we set many check points Pi (i=1,2,... n) , which are small enough for synchronization, and putation result voting is executed at each point. The safety putation flow of SIC is shown in Figure 5. StartStart0τ1τ2τ1P2P0τ1τ2τ1P2P0T0TC1iCi21T2T1T2T… … …… …… …n + 1τn + 1τnPnPnτnτc l o c kc l o c kSafety functionsTasks of interlocking logici:p:check pointInitializeSynchronization Guarantee SynchronousTime trigger Figure 5 Safety putational model of SIC 4. Hardware safety integrity level evaluation Safety Integrity As an authoritative international standard for safetyrelated system, IEC 61508 presents a definition of safety integrity: probability of a safetyrelated system satisfactorily performing the required safety functions under all the stated conditions within a stated period of time. In IEC 61508, there are four levels of safety integrity are prescribe, SIL1~ SIL4. The SIL1 is the lowest, and SIL4 highest. According to IEC 61508, the SIC belongs to safetyrelated systems in high demand or continuous mode of operation. The SIL of SIC can be evaluated via the probability of dangerous per hour. The provision of SIL about such system in IEC 61508, see table 1. Table 1Safety Integrity levels: target failure measures for a safety function operating in high demand or continuous mode of operation Safety Integrity
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