HONEYWELL DCS卡件 TC-OAV061 ANALOG OUTPUT MODULE 6 POINT
HONEYWELL DCS卡件 TC-OAV061 ANALOG OUTPUT MODULE 6 POINT
HONEYWELL DCS卡件 TC-OAV061 ANALOG OUTPUT MODULE 6 POINT
SIS：Safety Interlocking System（Safety Instrument Syetem）安全联锁系统/安全仪表系统
ESD：Emergency Shutdown System 紧急停车系统
SIS是系统化的概念，更关注整体性的概念，从命名就可以看出来，SIS关注回路，关注系统整体。 安全型的现场检测器件（变送器，仪表，传感器）---> 安全型 AI---》安全型控制器-安全型的DO---》安全型的现场执行器件（安全关断阀，泄压阀，保护器等）。
而ESD 通常是指，安全控制系统厂家生产的，安全型控制器，（CPU），IO，等纯控制系统的概念。
从本质上来讲，SIS 的硬件系统不光包括，SIS控制器及IO（例如 Triconex，HIMA，西门子400FH）。
还应包括所有跟控制器接口的其他输入部件，例如获得TUV SIL认证的传感器，变送器，检测装置；
还应该包括所有输出部件，如获得 TUV SIL认证的执行器（液压安全执行器，气动安全执行器，电动型安全执行器），
还应该有获得认证的现场设备。要求严格的现场，阀门本体也必须是有TUV 证书的。
例如核电厂的安全阀不光是锅炉与压力容器质检合格，还应该有核检证书，还应该有 TUV的安规证书，明确标明是SIL几等级。
ESD是生产厂家的安全性控制器用在不同的场合，根据不同的用途，有着这些不同的叫法，从理论上说， 只有ESD，“未必” 会是个完整的SIS控制系统。 ESD仅仅是 SIS中的一环，而且是在实体硬件中，是重要的一环。
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