西安地铁2号线信号系统采用完整的、基于无线通信技术的、移动闭塞制式的CBTC列车自动控制系统。
CBTC is adopted for signal system of Xi 'an Subway Line 2, which is a complete and movable block train control system based on wireless communication technology.
介绍可编程序控制器在地铁列车洗车机自动控制中的控制原理，着重介绍信号采集系统和列车前后端刷洗过程的控制结构及原理。
This paper introduces the control principle of PLC in the subway train - cleaning machine, especially de-scribes the structure and principle of signal - collecting system and the cleaning procession.
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