Immunity from dangerous breakdowns, Inerrancy. SafetyIn safe systems, it indicates the characteristic of a system... feature. In computerized systems in security it islsolation Mode the characteristicTerm of informations, documentation, statics for which the systemSet of interacting entities, conceptually aggregable in a ra... islsolation Mode designed and built toOperator Terminal be immune from failures that cause the unsafe state of the systemSet of interacting entities, conceptually aggregable in a ra... itself. Indicates the suitability of a systemSet of interacting entities, conceptually aggregable in a ra... toOperator Terminal comply with the specified SafetyIn safe systems, it indicates the characteristic of a system... requirementsAll the general rules and those specific to the signaling, f..., in any given operatingThe current management activities of the Railway Company, mo... condition and for a given period of time. In order toOperator Terminal define this characteristicTerm of informations, documentation, statics, it islsolation Mode necessary in principle toOperator Terminal consider all the causes of FailureIn railway traffic, various events, in line, station or at t..., random and systematic, which canController Area Network leadTerm of drive system, power transmission toOperator Terminal a state of danger (HazardCondition that could cause an accident). Many of these canController Area Network be defined quantitatively (for example in probabilistic terms), but others may depend on several factors, which cannot be accurately quantified, and canController Area Network only be considered qualitatively. In particular, during the design and construction phases of a safe systemSet of interacting entities, conceptually aggregable in a ra..., preliminary and final HazardCondition that could cause an accident analyzes (PHAPreliminary Hazard Analysis and HAHazard Analysis) are carried out, referring toOperator Terminal the use of the systemSet of interacting entities, conceptually aggregable in a ra... itself in its life cycle. The suitability of security, for the systems that require its specification, islsolation Mode defined through levels (Safety Integrity LevelSIL. See Safety integrity, SILSafety lntegrity Level), through the SafetyIn safe systems, it indicates the characteristic of a system... Integrity Level Definition (SIL-DSafety Integrity Level Definition), conventionally from 0 toOperator Terminal 4, which specify the “degree of immunity from dangerous failures”: level 4, very high, vital, critical for safety (safety criticalIt is called software, hardware and / or "critical" procedur...), Fail SafeIntrinsically safe failure. In security systems, technical d...; level 3, high, vital, critical for SafetyIn safe systems, it indicates the characteristic of a system... (safety criticalIt is called software, hardware and / or "critical" procedur...), high immunity (high integritySee Safety integrity); level 2, medium, semi-vital, connected toOperator Terminal SafetyIn safe systems, it indicates the characteristic of a system... (SafetyIn safe systems, it indicates the characteristic of a system... involved), average immunity (medium integritySee Safety integrity); level 1, low, semi-vital, connected toOperator Terminal SafetyIn safe systems, it indicates the characteristic of a system... (SafetyIn safe systems, it indicates the characteristic of a system... involved), low integritySee Safety integrity (low integritySee Safety integrity); level 0, not defined, not vitalDescription applied to those parts of the signalling system ..., not connected toOperator Terminal SafetyIn safe systems, it indicates the characteristic of a system... (non SafetyIn safe systems, it indicates the characteristic of a system... related), not in SafetyIn safe systems, it indicates the characteristic of a system... (non SafetyIn safe systems, it indicates the characteristic of a system...). In particular, the following canController Area Network be defined: the preliminary systemSet of interacting entities, conceptually aggregable in a ra... SILSafety lntegrity Level (pSysSILAlso pSIL. Preliminary System Safety Integrity Level or pSIL), the global and definitive systemSet of interacting entities, conceptually aggregable in a ra... SILSafety lntegrity Level (SysSILOr SIL. System Safety Integrity Level. Degree of immunity to... or SILSafety lntegrity Level), the SILSafety lntegrity Level of the hardwareIn computer science, the mechanical parts of a mechanical, e... and softwareThe set of instructions, which formalize the logic and opera... parts (HwSILHardware Safety Integrity Level and SwSILSoftware Safety Integrity Level). A secure systemSet of interacting entities, conceptually aggregable in a ra... must globally have SIL 4Safety integrity Level 4. Caratteristica di un sistema di ma..., while the component parts, depending on their competition toOperator Terminal safe operation, canController Area Network have both SIL 4Safety integrity Level 4. Caratteristica di un sistema di ma... and SILSafety lntegrity Level 3, 2, 1 and 0
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