In programmable logic controllers and motor control centers, these aluminum identification plates are mounted directly on terminal blocks, drive enclosures, and distribution panels. Each plate carries a permanent, engraved reference—such as a tag number, signal name, or safety warning—that remains legible through years of heat cycles, oil mist, and vibration. Technicians rely on these markings when they trace wiring during commissioning, troubleshoot faults during a night shift, or perform routine maintenance without powering down the entire line. The plates are fixed with stainless-steel rivets or adhesive strips that resist chemical cleaners, ensuring the label stays aligned with the component it identifies even after panel doors are opened and closed hundreds of times. Adjacent to automation, sheet-metal die shops use the same plates to mark progressive dies and punch stations, where each engraved reference guides operators in setting up tooling for new production runs.