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  A scanner is an option to a linear carriage which measures the log and, working with the linear positioner controller, performs a variety of functions for the sawyer.
It can provide a major increase in mill profit by increasing volume yield and grade recovery and production. 

The scanner includes several components. The first is a line of photo cell pairs in a line parallel to and just inside the sawline. The second is a pair of photocell lights on the carriage which indicate the position of the carriage along the track. The third, a computer, monitors the photocells and analyzes the information obtained. 

The scanner generates instructions to the set controller to position the log for two basic operating modes: Minimum Opening Face mode (including Taper Position and 1st Set for the Face), and Cant / Fill Mode (sometimes called "Best Opening Face") which places a cant (or dogboard) and fills the remainder of the log for opposite faces with prioritized sets specified by the mill. 

The scanner also keeps a tally of the length, diameter and footage of each log and generates production reports based on these tallies. The system can also provide management with downtime reports detailing duration and reason for the downtime. 

For a more detailed description of the Scanner and its functions please read How A Linear Positioner Carriage And Scanning System Improves Profit.