| 摘要 |
<p>The light grid has light barriers (L1-L3) that are arranged one above the other at predetermined intervals. The light barriers have transmitters (S1-S3) and receivers (E1-E3). A controller controls the light barriers based on analog control signal. The individual light barriers are successively actuated so that maximum light barriers are made to active state. The measuring resistors of transmitter and receiver are switched in series.</p> |
