| 摘要 |
The method involves securing a passage by a light grid with several light beams that run one above the other so that a safety function is released, if the light grid is interrupted, the release of the safety function is suppressed. Highest and lowest covered light beams (22b) of an object bit pattern are evaluated, and successive changes of the light beams are compared with appropriate changes of a reference bit pattern on correspondence during traversing of an object e.g. vehicle body. An independent claim is also included for a device for safety monitoring of a passage. |
