Detecting incorrectly fed sheets is what the BIS510 specialized vision sensor from Pepperl+Fuchs has been designed for. Reliable and convenient sheet verification is guaranteed thanks to fully automatic teach-in of reference images. The BIS510 is a small independent sensor containing a high-resolution camera and a control interface. The vision sensor monitors the correct sheet sequence on collating and folding machines, based on the print image. The first sheet is automatically taught-in and then compared with the subsequent sheets. The sensor can implement sheet verification at maximum speeds of up to 4 m/s and 10 sheets/s.