Interruption of the light beam must not be

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Unformatted text preview: ted by the technical control boards and passed in relation to the design. Access to presses and cutting machines in particular must be monitored because of their high accident risk rate. 6.3 Retro-reflective sensors 6.3.1 Function description Light emitter and light receiver are installed in one single housing. An additional reflector is required. Interruption of the light beam is evaluated. Interruption of the light beam must not be compensated by direct or diffuse reflection of an object. Transparent, bright or shiny objects may in some cases remain undetected. Mirroring objects must be positioned in such a manner that the reflecting beam does not impinge on the receiver. © Festo Didactic GmbH & Co. KG • FP 1110 81 6. Optical proximity sensors Compared to a diffuse sensor, the retro-reflective sensor has a greater range. Fig. 6.3.1: The principle of the retro-reflective sensor 6.3.2 Technical characteristics The table below lists the key technical data relating to retro-reflective sensors. The figures listed in this table are typical examples and merely provide an overview. Parameter Value Object material any, problems with reflecting obje...
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