Many assembly operations begin with the scanning of a 1D or 2D bar code. The code might tell an assembler what parts to install and how to install them. It might automatically configure a screwdriver for the correct torque, angle and fastening sequence for that specific assembly. Or, it might automatically set the force and displacement settings on a servo press.
Bar code scanning is also critical for traceability and inventory management. The codes provide data about what parts and subassemblies were installed, who installed them, when they were installed, and how many have been used.