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AssigneeWincor Nixdorf International GmbH
InventorThorsten Pawlak
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A method controls a light barrier where light is emitted from an optical transmitter to an optical receiver. The method checks whether reception levels fall below a lower threshold or exceed an upper threshold to determine whether the light barrier is interrupted. The thresholds initially are adjusted based on a predetermined minimum reception level, with each threshold being a fraction of the minimum reception level. An allowable reception level range is defined between the minimum level and a predetermined saturation level. The method checks whether the current reception level is outside the allowable reception level range, and, if this is the case, calibrates a parameter for operating the optical transmitter based on the minimum reception level and/or the saturation reception level. The parameter is calibrated by calculating a gradient of one characteristic curve of the light barrier and readjusting the parameter to a target value calculated based on the gradient.
A method (1000) for controlling at least one light barrier (108), wherein light (L) is emitted from an optical transmitter (T) to an optical receiver (R), wherein a current reception level (RV) is determined in dependence from the received light (L), and wherein a control circuit (110) is used to check whether the current reception level (RV) falls below a lower threshold (TH1) or exceeds an upper threshold (THh) to determine whether the light barrier (108) is interrupted or not, the method comprising:
A control circuit (110) for controlling at least one light barrier (108) that is used with an optical transmitter (T) that emits light (L) to an optical receiver (R), the control circuit (110) is connected to the receiver (R) or to a downstream converter stage (CNV) and determines an actual reception level (RV) in accordance with the received light (L), and the control circuit (110) checks whether the current reception level (RV) falls below a lower threshold (TH1) or exceeds an upper threshold (THh), to determine whether the light barrier (108) is interrupted or not, the control circuit comprising:
Dependencies are inferred from the claim text.