A method for synchronizing a light curtain

A light grid (10) comprises a transmitting unit (20) having a plurality of transmitters (22), a receiving unit (24) having a plurality of receivers (26), a transmitter controller (44), the transmitter (22) in one cycle ( T) activated in sequence, and a receiver control unit (32) for evaluating the receiver (26). Each transmitter (22), a respective receiver (26) associated with an activated and transmitter (22) transmits to the receiver (26) includes a transmit beam (28). At least two transmission beams (28) in the cycle T are synchronization transmission beams (29), the (D) are sent out to each other at a time interval. The receiver control unit measures the time interval (D), wherein on the basis of the time interval (D) is a unique assignment of the sync transmission beams (29) to the total of transmission beams (28) in the cycle (T) is carried.