DDC通讯故障分析  

Communication Fault Analysis of DDC

作　　者：陈寅生[1] 

机构地区：[1]中国航空规划建设发展有限公司,北京100120

出　　处：《智能建筑电气技术》2012年第3期72-75,共4页Electrical Technology of Intelligent Buildings

摘　　要：在楼宇自控系统的调试、使用过程中,常常遇到控制系统发生通讯故障,影响系统的正常运行。本文通过介绍通讯电路的工作原理和传输方式等基本特性,分析产生问题的原因,阐述了共模电压影响通讯电路的几种情况;以及如何正确连接通讯设备的终端电阻;从工程角度分析设备内部通讯电路结构与通讯线屏蔽层接地问题;并对实际工程情况产生的部分通讯故障进行了分析。In the process of debugging and using of building automative control systems, we often meet with communication faults, which may influence the normal operation of the system. Through introducing the principle and transmission mode of the communication circuit, this article analyses the cause of problems, expounds some instances that common-mode voltage affecting communication circuits and how to connect the termination resistor of communication equipment correctly. It analyses the inside structure of communication circuit and shielding layer grounding of cables from the aspect of engineering, as well as some communication faults in practical projects.

关 键 词：共模电压 屏蔽接地 瞬间抑制 故障分析 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]