ABB UNS2882A 3BHE003855R0001 PLC控制系统CPU处理器模块

ABB UNS2882A 3BHE003855R0001 PLC控制系统CPU处理器模块

ABB UNS2882A 3BHE003855R0001 PLC控制系统CPU处理器模块

DCS级和控制管理级是组成DCS的两个基本的环节。

过程控制级具体实现了信号的输入、变换、运算和输出等分散控制功能。在不同的DCS中，过程控制级的控制装置各不相同，如过程控制单元、现场控制站、过程接口单元等等，但它们的结构形式大致相同，可以统称为现场控制单元FCU。过程管理级由工程师站、操作员站、管理计算机等组成，完成对过程控制级的集中监视和管理，通常称为操作站。DCS的硬件和软件，都是按模块化结构设计的，所以DCS的开发实际上就是将系统提供的基本模块按实际的需要组合成为一个系统，这个过程称为系统的组态。

现场控制单元

现场控制单元一般远离控制中心，安装在靠近现场的地方，其高度模块化结构可以根据过程监测和控制的需要配置成由几个监控点到数百个监控点的规模不等的过程控制单元。

现场控制单元的结构是由许多功能分散的插板（或称卡件）按照的逻辑或物理顺序安装在插板箱中，各现场控制单元及其与控制管理级之间采用总线连接，以实现信息交互。

现场控制单元的硬件配置需要完成以下内容:

插件的配置根据系统的要求和控制规模配置主机插件(CPU插件)、电源插件、I/O插件、通信插件等硬件设备;

硬件冗余配置对关键设备进行冗余配置是提高DCS可靠性的一个重要手段，DCS通常可以对主机插件、电源插件、通信插件和网络、关健I/O插件都可以实现冗余配置。

ABB UNS2882A 3BHE003855R0001 PLC控制系统CPU处理器模块

DCS level and control management level are the two basic components of DCS.

The process control level realizes the decentralized control functions of signal input, transformation, operation and output. In different DCS, the control devices of the process control level are different, such as process control unit, field control station, process interface unit, etc., but their structural form is roughly the same, and they can be collectively referred to as field control unit FCU. The process management level is composed of engineer station, operator station, management computer, etc., to complete the centralized monitoring and management of the process control level, usually called the operation station. The hardware and software of DCS are designed according to the modular structure, so the development of DCS is actually to combine the basic modules provided by the system into a system according to the actual needs, this process is called the configuration of the system.

Field control unit

The field control unit is generally far away from the control center and installed near the site, and its highly modular structure can be configured into process control units ranging in size from a few monitoring points to hundreds of monitoring points according to the needs of process monitoring and control.

The structure of the field control unit consists of a number of boards (or cards) with decentralized functions installed in the board box in a logical or physical sequence. The field control unit and its control management level are connected by bus to realize information exchange.

The hardware configuration of the onsite control unit is as follows:

Configure hardware devices such as host plug-ins (CPU plug-ins), power plug-ins, I/O plug-ins, and communication plug-ins according to system requirements and control scale.

Hardware redundancy configuration Redundant configuration of key devices is an important means to improve the reliability of DCS, DCS usually can host plug-ins, power plug-ins, communication plug-ins and network, key I/O plug-ins can be redundant configuration.