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安全控制系统技术的发展    安全控制系统是专门用于危险场所（如：石油化工装置）联锁和紧急事故停车的控制系统。它和普通工艺过程控制的DCS和PLC的本质区别在于，其功能是在事故和故障状态下（包括装置事故和控制系统本身发生故障时），使装置能够安全停车，并处于安全状态下，从而避免灾难的发生，即避免对装置人员的伤害及对环境的影响等，因而安全控制系统本身必须是故障安全型（Fail to Safe）的，系统的硬件和软件的可靠性都要求很高。在国际安全标准IEC61508中，对安全等级及安全控制系统的要求具有详尽的规定。TüV是目前世界上唯一的安全控制系统认证机构。     自1970年HIMA公司首先推出TüV认证的故障安全型安全控制系统HIMA-Planar-System起，安全控制系统已有三十年的发展史。  HIMA的H41q/H51q系统为CPU四重化结构（QMR-Quadruple Modular Redundant），即系统的中央控制单元共有四个微处理器，每二个微处理器集成在一块CU模件上，再由两块同样的CU模件构成中央控制单元。一块CU模件即构成1oo2D结构，HIMA的1oo2D结构产品就可以满足AK6/SIL3的安全标准。为了向用户提供最大的可利用性，采用双1oo2D结构，即2oo4D结构。在冗余结构的情况下，高速双重RAM接口（DPR）使两个中央单元通讯，从而解决了无故障修复时间限制的难题。其容错功能使系统中的任何一个部件发生故障，均不影响系统的正常运行

高可靠性和高可用性

Tricon系统的硬件核心是基于三重模件冗余容错 （TMR）结构的控制器，TRICON 系统有三个主处理器，每一个主处理器的CPU 32 位，工作方式为3-2-1-0。其32 位浮点协处理器的使用得到了TUV AK6 级的安全认证。系统中所有的I/O 信号都经过硬件的三取二表决，以及内置的系统自诊断功能，使系统具备了高的可靠性和可用性。

优点

○ 高可靠性和高可用性

○ 主处理器和 I/O 卡件均为三重模件冗余

○ 不因单点故障造成系统停车或失效

○ 各类卡件均可在线更换

○ TUV AK6 安全认证

○ 内置高覆盖率的诊断功能，不需编写应用程序

○ 按照 IEC 61131-3 标准设计的基于Windows 的编程软件使用方便，提供离线模拟测试

○ 软件的在线修改下装，通过 TUV 六级认证

○ 先进、成熟的机组控制软件包，实现透平机械控制、保护的全部功能

○ 毫秒级的 SOE 功能，为故障及事件分析提供可靠的依据

主要应用

○ 安全仪表系统SIS

○ 透平压缩机控制系统ITCC

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