Question

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Research on Integration of Coal Mine Monitoring and Control System with Field Bus Control System
Abstract:According to the construction of current coal mine monitoring and control systems in China,the paper proposes three kinds of applicable schemes of integrating PLC and DCS systems with field bus technology to digitize the system and to improve the flexibility and extent of the system.Essentially,the paper introduces the integration of FCS on I/O layers.Based on a real coal mine safety-monitoring and control system applied with a CAN field bus,the major technology of system relays and extensions is discussed.We believe that one of the most applicable methods is currently replacing the connection between function-stations and field-sensors with a CAN bus on I/O layers for system integration.
Key words:monitor and control;field bus control system;CAN;integration

1 Coal Mine Monitoring and Control System and Field Bus Technology
As one of the most important methods to improve modern management and production efficiency in coal mines,monitoring and control technology have been widely adopted to maintain safety in coal production.Taking advantage of foreign technologies from the 1980’s,coal mine monitoring and control systems have expanded rapidly in China.At present, automatic control has come into use in most large-scale coal mines,which greatly improved production efficiency and safety and lowered costs.
In China,most sub-systems of coal mine systems work independently.They follow a DCS system structure of three layers(center layer,sub-station layer and sensor layer)which consists of a tree to-pology.They are composed of sensors,sub-stations on or under the ground,center stations,multiple controllers and display terminals(Fig.1).They work with analogue signals of 4–20 mA or 200–1000 Hz. Each coupled cable can only act as one line for transmission[1].
Currently control networks have been developed for digitalization and networking.Because traditional analogue signals of 4–20 mA or 200–1000 Hz can only carry simple measurement information and con-trol signals,the communication rate is restricted. Therefore,it is necessary to digitalize and network the entire monitoring and control system. Fig.1 Traditional Structure of Coal Mine Monitoring and Control System

Answer 1

集成研究煤矿监测和控制系统与现场总线控制系统
摘要：根据建设目前煤矿监测和控制系统在中国，提出了三种适用的计划相结合的PLC与DCS系统，现场总线技术的数字化系统，以及改善的灵活性和程度的系统。基本上，介绍了一体化的功能界别中I / O layers.based对一个真正的煤矿安全监测和控制系统的应用与CAN现场总线，主要技术系统的继电器和讨论了扩展，是相信之一最适用的方法，是目前取代之间的连接功能和外地传感器与CAN总线上的I / O层的系统集成。
关键词：监测和控制;现场总线控制系统;可以;一体化

一煤矿监测和控制系统和现场总线技术
作为其中一个最重要的方法来提高现代管理和生产效率，在煤矿，监测和控制技术已被广泛采用，以维持煤矿安全production.taking利用外国技术，从1980年的，煤矿监测和控制系统有迅速扩大，在china.at目前，自动化控制已投入使用，在多数大型煤矿，这大大提高了生产效率和安全，降低成本。
在中国，最个子系统煤矿系统工作independently.they按照集散控制系统结构的三个层次（中心层，分站层和传感器层）构成的树- pology.they组成的传感器，分站上或地面下，中心站，多个控制器和显示终端（图1 ） 。他们的工作与模拟信号的4月20日，马或200-1000赫兹。每个再加上有线电视只能作为一条线为传输[ 1 ] 。
目前控制网络已开发了数字化和networking.because传统的模拟信号的4月20日，马或200-1000赫兹只能进行简单的测量信息和CON - trol信号，通信速率受到限制。因此，有必要以数字化和网络整个监测和控制系统。图1传统结构的煤矿监测和控制系统