The system design is reasonable, safe and reliable, fully meet the normal tripping and emergency brake of drilling rig, the light drilling and workover machines, has a good application prospect.

该系统设计合理、安全可靠，完全满足钻机起下钻和紧急刹车，在轻型钻机和修井机上，具有很好的应用前景。

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In this paper, principle and composition of the centralized monitoring system of emergency light with fire control is discussed, including features of hardware and software design.

介绍了消防应急灯集中监控系统的工作原理及组成，对软硬件的设计特点进行了一定的叙述。

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The signal preemption idea was born in the early 1970s, when 3M devised a system that let emergency vehicles change traffic signals with pulses of strobe lights (later, infrared light) transmitted to receivers mounted over roadways.

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