490NRP25400
490NRP25400
490NRP25400
在IEC61508和IEC61511里,对嵌入式程序和计算机软件的可靠性和安全性的评估提供了一些方法,流派较多。但是这些内容多半比较原则,实施时严重依赖评估者的经验和水平设计和评估是远远不够的,这些方面的需求促使各方面加大了嵌入式程序和计算机软件的可靠性的研究。从编程语言的角度看,IEC61508-3电气/电子/可编程电子安全相关系统的功能安全第3部分:软件要求对全可变语言(FVL,如C、C++、汇编语言)在安全应用程序层次和嵌入式软件、固件、操作系统层次做了原则性的规范;而对有限可变语言(LVL,如IEC61131-3的PLCopen组织安全扩展)在安全应用软件层次的规范,则在IEC标准和ISA的对应标准ISA84过程仪表安全系统的功能安全及相关技术报告中对此部分做了细化和补充,虽然离,统一解决方案尚有距离,但已足以使各企业可以开展功能安全的开发和设计了。
备货,备货,降降降,火火火,火火火……
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