介绍了一种新型双线制医用呼叫系统的实现原理。

This paper introduces the principle of a new kind of calling system used in hospital in detail.

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本实用新型测量结果漂移小，准确度高、寿命长，而且为双线制。

The utility model has the advantages of little drift for measurement results, high accuracy and long service life, and the utility model is a two-wire system.

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论述了提高矿井提升安全的智能双线制安全控制原则，针对目前煤矿提升安全现状，提出了用P LC实现提升机智能双线控制技术的方法。

This paper discussed the rule for improving safety of mine winder with double-line system, and gave the way to accomplish it based on PLC technique fitting for the real safety status.

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