现场总线在应用中主要考虑其通信电缆、通信电源故障，“T”型分支或终端电阻故障也会引起总线故障。
The main facts we should consider are the trouble caused by the communication cable, communication power, t type branch or the terminal resistor problem in the application of site bus technology.
终结器就是置于电缆终端的一个电阻负荷，用来防止数据信号又反射回到线路中去。
A resistive load placed at the end of a cable to prevent data signals from reflecting back into the data path.
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