SIS和ESD系统到底有什么不同? 我看了 漠北逸海 给我的链接，越看越是困惑，呵呵~~~~ 以下是一个项目的sis系统的部分说明，个人感觉不出来到底和esd的区别 the project requires that the sis provide high reliability, indicated by a very high mtbf (mean time between failure) for the complete system (including the signal interface modules). 项目要求sis系统（整个系统包含单独的模块）必须有很高的可靠性（用平均故障间隔时间来衡量）。 the following list highlights some required functions/features, which are specified later in this document in detail： 下面着重描述对系统功能的要求： the sis system with marshalling cabinets and all of the interfaces cabinets will be located in the frr. some network components will have to be installed in the field rack room. sis系统有端子柜，所有接线柜和网络部件位于机柜室。 instruments connected to the sis will be connected conventionally with single pair cables to field junction boxes. the junction boxes will be connected with muiticore cables to marshalling cabinets, interface cabinets and i/o-cabinets 通常，所有连至sis的现场仪表用单对双绞电缆接至现场接线箱。接线箱用多芯电缆接至端子柜、接线柜或i/o卡柜。 dcs and sis signals are segregated in different junction boxes and muticore cables. dcs和sis信号线应分开接至不同接线箱和多芯电缆。 generally analogue signals will be used for shutdown purposes. all signals, which can shut down the plant, will be triplicated. 一般地，模拟量信号用于停车。所有用于停车的信号必须三重化冗余。 communication between sis and dcs shall be at minimum redundant modbus rtu using rs485 interface. if supported by vendor, the dcs and sis may communicate via systembus and other communication protocols resulting in higher data transfer rates. sis和dcs系统间用modbus rtu协议通讯，rs485接口。如果制造厂提供，dcs和sis系统间通讯可以通过系统总线或其他通讯协议来提高数据传输速率。 all sis-signals will be transmitted to dcs for indication via a redundant bus to the dcs. if a signal is used for control functions an additional hard-wired signal from the sis to the dcs will be used. if the sis and dcs share the same system busthe hard-wired signal is not required. 所有sis信号可以通过冗余通讯线通讯到dcs显示。如该信号用于控制功能，需再单独用硬线接到dcs。如果dcs和sis用相同系统线则硬线不需要。 signals between sis and mcc (interlock) will be connected hardwired. sis和mcc间的信号需要用硬线连接。 one dedicated engineering station shall be provided for configuration and monitoring in the engineering room, located in the main control room building. another engineering station shall be permanently located in one of the frr. 工程师室（位于中央控制室）需设置单独的工程师站用于组态和监控。另一个工程师站长期放置于现场机柜室。 a soe system will sort all events according to their time information and store the data for later analysis. time stamp will be generated in sis. the engineer can filter and select which events shall be printed. the soe system may be installed on the engineering station. soe站用于分类事件报警和存储数据以便以后分析。sis产生时间标记，工程师过滤筛选那些事件记录需要打印。soe站放在工程师室里。 the sis shall allow for time synchronization by an external master clock (supplied by dcs) or shall come with its own master clock (gps). sis需允跟外部的主时钟（dcs产生）保持时钟同步或跟它自己的gps时钟同步。 the hardware must be designed to withstand the environmental, electrical and physical conditions of industrial environments。 硬件制造需考虑到当地环境、电气条件和工程环境因素。查看更多
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