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系统硬件方面  symphony系统的节点类型：现场控制单元、人系统接口设备、系统工程工具、计算机接口设备和网络接口设备五种节点。   现场控制单元（harmony control unit）hcu：用于过程控制，实现物理位置相对分散、控制功能相对分散的主要硬件设备称之为现场控制单元。   多功能处理器（mult-function processor）：在现场控制单元中，以微处 理器为核心，通过子总线和相关子模件获得现场i/o并能进行多种控制运算的智能模件，称之为：多功能处理器（mult-function processor），简称：mfp。   人系统接口设备（human system interface）：用于现场的过程监视、操作、记录管理等功能，以通用计算机为基础的人与系统接口设备称为：人系统接口设备（human system interface），它的型号为conductor。   系统工程工具composer：用于工程组态、系统监视、系统维护等功能，以通用计算机为基础的工程设备称为：系统工程工具，它的型号为composer。   计算机接口单元（computer interface unit）：用于symphony系统在通信网络上与其它计算机及有关控制设备接口的硬件设备称为：计算机接口单元（computer interface unit），简称ciu。   网络接口设备（network interface unit）：用于symphony系统网络和网络连接的硬件设备称之为网络接口设备。常用的型号有iil、ipl。 

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