求翻译：皮带尾部装有一个圆形速度检测器同皮带一起转动，用于检测皮带尾部速度。当皮带转动时，检测器圆周上某一段区域可以被探头检测到，并输出低电平至PLC，没有检测到检测区域是，输出高电平至PLC。是什么意思？

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Belt trailer fitted with a circular speed detector belt with a belt and is used to detect turn tail. When the belt when you turn on the circumference, a region can be detected by probe, and output low, there is no test to PLC region is detected, the output level to PLC.

The leather belt rear part is loaded with a circular speed detector to rotate together with the leather belt, uses in examining the leather belt rear part speed.When the leather belt rotates, in the detector circumference some section of regions may poke head in to examine, and outputs the low level

Tail of the belt is equipped with a circular speed detector rotation together with the belt, used to detect the tail of the belt speed. When the belt rotates, certain regions of the detector perimeter can be detected by the probe, and low level output to the PLC, no detection area is detected, the o

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