通过以太网传输的安全级别协议的主要标准已经使用了15年以上了。定义现代数字化安全系统需求的主要规范包含在以下标准中:国际电工委员会(IEC)61508 电气/电子/可编程安全级别系统的功能性安全,以及IEC 61784-3 工业通讯网络-配置文件 -第3部分:功能性安全现场总线-通用规则及配置文件定义。
第一批数字化安全系统是采用了单独的、自有的通讯总线的专用控制器。这对于实现安全性来说是前进了一步,可是需要为其设计师和最终用户提供额外的硬件、编程软件、许可、以及额外的现场总线。
诸如EtherCAT这种快速的、高效的工业以太网系统的出现使人们有可以使用IEC 61784-3推荐的“黑色通道”方式。同时也给出了另一个重要的建议,即安全数据通道不能超过目标安全完整性等级(SIL)安全级别最大失效概率的1%,安全配置文件是根据SIL的安全级别设计的。这可以让安全协议集合在现场总线系统内部“打开通道”,极大程度上简化了安全系统的硬件和软件。Safety over EtherCAT (FSoE))协议符合IEC 61748-3标准中的功能安全通讯设备行规([FSCP 12])。在FSoE上的大多数EtherCAT功能性安全的设备都是SIL3级别的。
FSoE的趋势
FSoE的发展趋势是接受来自多家供应商的安全逻辑控制器和安全输入/输出(I/O)设备。已有27家公司生产的产品作为FSoE系统的补充。这也是基于众多供应商对EtherCAT的支持,其中包括200家主控制器供应商、105家I/O供应商、以及160家传动设备供应商。
除此以外,具有安全运动功能的伺服传动已经问世,由于运动控制器可以为了安全停止、安全转矩、以及安全位置(请见表格)而直接向传动设备发送安全功能指令,已经使运动控制产品供应商及用户的自动化设计更加高效合理。不仅如此,不再需要给传动设备停止供电, 这一直以来都是争论的焦点,特别是在考虑例如在按下紧急停止按钮之后,一个惯性滑行的飞轮是否真的可以建立最安全的状况。
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