一、前言 在煤矿的安全与生产中,井下环境的监视、机电设备的控制、通信系统都是致关重要的。特别是在煤或瓦斯突出、自然发火、井下火灾等灾害的情况下,及时掌握井下状况则是必不可少的。近年来,为判明井下情况,煤炭技术研究所试图将一般企业内用的情报通信网络(Locai Area Netwru系统,简称LAN系统)引用到煤矿中。在电 I. Preface In the safety and production of coal mines, the monitoring of the underground environment, the control of mechanical and electrical equipment, and the communication system are all of crucial importance. Especially in the case of coal or gas outburst, natural fire, underground fires and other disasters, the timely grasp of underground conditions is essential. In recent years, in order to determine the situation underground, the Coal Technology Institute has tried to refer to the coal mine for the Locai Area Netwru system, which is generally used in the enterprise. In electricity