现场仪表

全数字现场仪表通信系统及协议的研究

The Investigation on Fully Digital Field Instrument System and the Protocol

本文详细介绍了应用DCS对液化气吸收塔的工艺参数实现选择性控制的原理和方案，以及现场仪表的选型和实施。

The principle and scheme of selective control on process variables of LPG absorbing tower by use of DCS is explained in detail , including the selection and implementation of field instrument .

适应DCS系统水平的现场仪表

Field Instruments Adapted to DCS

基于EPA标准的现场仪表研究与开发

Standard The Development of Instrumentations Based on EPA Specification

中央站、分站、现场仪表、控制网络是BA系统的基本组件。

Now BA System comprises the basic components , here they are : central station , sub-station , spot meters , Control Network .

为了满足工业现场仪表的通信要求，设计了符合HART协议的智能执行器通信接口卡。

Aiming at the communication requirement of the spot meter , the interface of the executor based on HART protocol was exploited .

EPA现场仪表是EPA控制系统的重要组成部分，它在低功耗、可靠性、实时性等方面都有着特殊的要求。

The EPA field instruments are the important parts of the EPA control systems . Low power consumption , reliability and real time are their special requirements .

Profibus-PA现场仪表接口开发与应用

The Development and Application of Profibus-PA Based Field Instrument Interface

基于HART协议的现场仪表已普遍使用，这些仪表主要是通过传统的RS-232接口实现同上位机之间的通信。

Most of the HART protocol . based field instruments have been popularly used . These instruments are communicated with host computer through traditional RS-232 interface .

仪表回路试验是装置开车前的联动检查，是对现场仪表的状态、特性以及计算机控制系统（如DCS、ESD、PLC等）组态功能的全面检查和确认。

Meter loop experiment is unite inspection before starting machine , it is the overall inspection and confirming of the state , property as well as computer control system ( DCS , ESD and PLC etc. ) .

该系统由PC机、PLC、现场仪表和设备组成，通过现场总线和工业以太网将现场各种工艺参数、报警信号、历史数据进行传送，实现了整个生产过程的自动控制。

The system is composed of PC , PLC , on-site instruments and equipments . The field process parameters , alarm signals , history data can be transmitted by field bus and Industrial Ethernet , so the whole process auto-control can be realized .

HART通讯协议在4～20mA模拟信号上增强了双向数字通讯，并被广泛采用为现场仪表数字通讯标准。

HART protocol enhances the two-way digital communication in 4 ~ 20mA analog signal and has been widely applied as the standard for digital communication .

结合200kt/a聚丙烯装置改造工程，分析了选用SIS的特点，并从现场仪表的设计、控制室硬件的设计、系统软件组态三个方面给出了SIS详细设计方案。

The detailed scheme of SIS from three aspects : the design of field instruments , the arrangement of hardware in control room and the programming and debugging of system software are presented .

该系统通过现场仪表设备进行现场控制和数据采集，通过RTU（RemoteTerminalUnits远程终端单元）存储数据信息并与中心监控站通信，利用GPRS远程数据传输接收或者发送数据。

In order to realizing field controlling and data acquisition through instrumentation , this system stores data information and communicates with the center monitor by RTU ( Remote Terminal Units ), as well as uses GPRS remote data transmission to receive and transmit data .

在现场仪表和工业设备领域，应用嵌入式网络技术是工业控制网络的一个发展趋势，利用Linux构建嵌入式系统是近年来出现的一种设计方案。

In the fields of field instrument and industry equipment , use the embedded network technology to be a development trend of the industrial control network . It is a kind of design plan appearing in recent years to utilize Linux to structure the embedded system .

整个控制系统由上位机、PLC、各现场仪表、传感器以及各种执行机构组成，通过PLC强大的数据采集、通讯以及控制功能，使整个生活污水处理系统的自动控制能够得到良好实现。

The whole system is made up with upper computer , PLC , field instruments , sensors and execution units . The automatic control system of daily sewage processing unit on ship can be accomplished well by the powerful function in data acquisition , communication and control of PLC .

应用HART协议能使仪表既保留传统两线制传输的优点，并且还可实现多主通信、多点控制，易于对远距离现场仪表进行组态控制。

By making use of the HART protocol not only can retain the advantages of the traditional two wire system transmission , but also can realize multimaster communication , multipoint control and configuration control of remote field instruments .

系统采用了IPC-PLC模式的分布式结构，由上位机操作站，下位机控制站和现场仪表三部分组成。

The system with IPC-PLC pattern distributive structure is composed of host operation station , hypogynous-machine control station and field instrument .

另一方面是软件，主要是针对TCP/IP协议进行套接字（SOCKET）编程实现数据的通信和针对现场仪表协议进行编程实现数据的采集，完成上位机监控软件的设计以及下位机数据采集的功能。

The part work of software include : applied SOCKET technology and TCP / IP protocol to realize data communication program , and applied field meter protocol to realize data acquisition program , so that achieve the PC monitoring software design and the module acquisition function .

20世纪90年代中后期，国内外各大工控公司纷纷在其控制系统中采用以太网，推出了基于以太网的DCS、PLC、数据采集器，以及基于以太网的现场仪表、显示仪表等产品。

During 90 ages of 20 century , many big industrial company inside and outside adopted the Ethernet in their system one after another , produced DCS , PLC , date collection implement based on Ethernet , in addition to some locale meter and display meter also based on Ethernet .

针对工业仪表标准的模拟信号和RS-232数字信号的输出，模块把从现场仪表采集的测量数据进行软件处理并以MODBUS通讯协议组网远传。

According to the output of standard analog signals and RS-232 digital signals of the industrial meters , the module can manage the data acquiring from the spot meters by software programming and then transmit them remotely based on MODBUS protocol .

下位机采用了西门子S7-300PLC，它和现场仪表共同完成对现场的控制和数据采集。

The hypogynous-machine control station which used Siemens S7-300 PLC and field instrument are to accomplish field control and data collection .

现场仪表层和下位机控制站通过西门子S7-300PLC、现场控制阀门和现场仪表共同完成对现场数据的采集与现场的控制。

The locale instrument layer and hypogynous-machine control station , which include Siemens S7-300 PLC and field control instrument , is to accomplish data collection and field control .

嘉兴发电厂现场仪表自动校正维护管理系统

The Instrument Auto-calibration Maintenance Management System of Jiaxing Power Plant

智能现场仪表在水库大坝自动化系统中应用

Application of intelligent field instrument to dam automatic monitoring system of reservoir

氨汽提法尿素装置现场仪表的设计与选用

Design and Selection for Local Instrument of Urea Plant with Ammonia Stripping Method

监督现场仪表的测试，校正以及负责现场安装仪表的验收。

Supervise the testing , calibration on field and acceptance of installed instrumentation .

现场仪表的智能化管理

Intelligent Management of Scene Instrument

一种低成本测控网络的现场仪表设计与应用

The Design and Application of the Field Instrument of a Low - Cost Measuring and Control Network

该监控系统分为三层：现场仪表层、下位机控制站和上位机操作站。

Monitoring system has three layers : field instrument layer , hypogynous-machine control station and host operation station .