DCS系统技术说明书
DCS system technical specification
系统介绍/System introduction
DCS是分散控制系统（Distributed Control System）的简称，国内一般习惯称为集散控制系统。它是一个由过程控制级和过程监控级组成的以通信网络为纽带的多级计算机系统，综合了计算机（Computer）、通讯（Communication）、显示（CRT）和控制（Control）等4C技术，其基本思想是分散控制、集中操作、分级管理、配置灵活、组态方便。
DCS is the short for Distributed Control System (Distributed Control System), and it is commonly called distributed control system in China. It is a multilevel Computer system composed of process Control level and process monitoring level with Communication network as the link, integrating computer (Computer), communication (Communication), display (CRT) and control (Control) etc. The basic idea is decentralized control, centralized operation, hierarchical management, flexible configuration and convenient configuration.
系统的主要技术特点概述/The main technical characteristics of the system are summarized
1、系统主要有现场控制站（I/O站）、数据通讯系统、人机接口单元（操作员站OPS、工程师站ENS）、机柜、电源等组成。系统具备开放的体系结构，可以提供多层开放数据接口。
The system mainly consists of field control station (I/O station), data communication system, man-machine interface unit (operator station OPS, engineer station ENS), cabinet, power supply and so on. The system has an open architecture and can provide multi-layer open data interface.
2、硬件系统在恶劣的工业现场具有高度的可靠性、维修方便、工艺。底层汉化的软件平台具备强大的处理功能，并提供方便的组态复杂控制系统的能力与用户自主开发专用高级控制算法的支持能力；易于组态，易于使用。支持多种现场总线标准以便适应未来的扩充需要。
The hardware system has high reliability, easy maintenance and advanced technology in harsh industrial sites. The underlying Chinese software platform has powerful processing functions, and provides convenient configuration of complex control systems and users to develop special advanced control algorithms. Easy to configure, easy to use. Multiple fieldbus standards are supported to accommodate future extensions.
3、系统的设计采用合适的冗余配置和诊断至模件级的自诊断功能，具有高度的可靠性。系统内任一组件发生故障，均不会影响整个系统的工作。
The design of the system adopts suitable redundancy configuration and self-diagnosis function from diagnosis to module level, which has high reliability. The failure of any component in the system will not affect the work of the entire system.
4、系统的参数、报警、自诊断及其他管理功能高度集中在CRT上显示和在打印机上打印，控制系统在功能和物理上真正分散，DCS·整个系统的可利用率至少为99.9％；系统平均时间为10万小时，实现了核电、火电、热电、石化、化工、冶金、建材诸多领域的完整监控。
The parameters, alarm, self-diagnosis and other management functions of the system are highly concentrated on the CRT display and printed on the printer, the control system is really dispersed in function and physics, and the utilization rate of DCS and the whole system is at least 99.9%; The average trouble-free time of the system is 100,000 hours, which realizes the complete monitoring of nuclear power, thermal power, petrochemical, chemical, metallurgy and building materials.
5、域”的概念：把大型控制系统用高速实时冗余网络分成若干相对独立的分系统，一个分系统构成一个域，各域共享管理和操作数据，而每个域内又是一个功能完整的DCS系统，以便更好的满足用户的使用。
The concept of "domain" : the large-scale control system is divided into a number of relatively independent sub-systems with high-speed real-time redundant networks, a sub-system constitutes a domain, each domain shares management and operation data, and each domain is a fully functional DCS system in order to better meet the use of users.
6、网络结构可靠性、开放性及性。在系统操作层，采用冗余的100Mbps以太网；在控制层，采用冗余的100Mbps工业以太网，保证系统的可靠性；在现场信号处理层，12Mbps的PROFIBUS总线连接控制单元和各现场信号处理模块。
Network structure reliability, openness and advanced nature. In the system operation layer, redundant 100Mbps Ethernet is used; In the control layer, the redundant 100Mbps industrial Ethernet is used to ensure the reliability of the system. In the field signal processing layer, the 12Mbps PROFIBUS bus connects the central control unit and the various field signal processing modules.
7、标准的Client/Server结构。有的DCS的操作层采用Client/Server结构，开放并且可靠的操作系统。系统的操作层采用WINDOWS NT操作系统；控制站采用成熟的嵌入式实时多任务操作系统QNS以确保控制系统的实时性、安全性和可靠性。
Standard Client/Server architecture. Some DCS operating layer adopts Client/Server structure, open and reliable operating system. The operating layer of the system adopts WINDOWS NT operating system. The control station adopts the mature embedded real-time multi-task operating system QNS to ensure the real-time, security and reliability of the control system.
8、标准的控制组态软件。系统采用IEC61131－3标准的控制组态工具，可以实现任何监测、控制要求。可扩展性和可裁剪性，保证经济性。
Standard control configuration software. The system adopts IEC61131-3 standard control configuration tool, which can realize any monitoring and control requirements. Scalability and tailoring to ensure economy.
DCS一般控制规模/DCS generally controls scale
1、输入/输出信号类型/Input/output signal type
DCS的过程控制器应能直接接收或处理以下各种类型的输入和输出信号，包括模拟量输入、数字量输入、模拟拟量输出。数字量输出。
The DCS process controller should be able to directly receive or process the following types of input and output signals, including analog input, digital input, analog analog output. Digital output.
2、DCS系统功能要求/Functional requirements of DCS system
2.1、系统一般具备有控制功能、连续控制、离散控制功能、系统监视功能、监控软件功能包括总貌画面、分组画面。趋势画面，报警画面、图形画面、棒图等。
The system generally has control function, continuous control, discrete control function, system monitoring function, monitoring software function including the overall picture, grouping picture. Trend screen, alarm screen, graphic screen, bar chart, etc.
2.2、报警功能/Alarm function
当报警发生时，系统将具有以下动作，一、系统将根据报警的级别和设置实时打印当前的报警内容；二、同时系统产生声响报警，并提供报警颜色的变化，用以提示操作者。报警类型至少具有下列类型，高报、低报、高高报、低低报、偏差报等。三、当要求联锁控制时应具备联锁功能，联锁控制功能包括布尔逻辑和梯形逻辑。
When the alarm occurs, the system will have the following actions, first, the system will print the current alarm content in real time according to the alarm level and setting; At the same time, the system generates an audible alarm and provides a change in the alarm color to prompt the operator. Alarm types have at least the following types, high report, low report, high report, low report, deviation report and so on. Third, when the interlock control is required, it should have an interlock function, and the interlock control function includes Boolean logic and ladder logic.
