Light grid for use in gate controller for monitoring slalom pathways, has evaluation unit including frame function that differentiates interruption of optical paths by gate leaf from interruption of paths by obstacle during assembling grid

摘要

The grid has an evaluation unit for evaluating signals of light barriers that are arranged one above another, where the individual light barrier comprises transmitters (Su) and receivers (Eu, E1-E3). The evaluation unit includes a frame function that differentiates an interruption of optical paths (Lu, L1-L3) by a gate leaf (2) from interruption of the optical paths by an obstacle during assembling the grid in a frame (3) of a gate. The evaluation unit includes a plausibility function that determines whether the optical paths are interrupted by the gate leaf or obstacle.