Freightliner Factory Will Use RFID to Track Production

By Beth Bacheldor

Sept. 15, 2006—Next week, Freightliner, a maker of medium- and heavy-duty trucks and specialized commercial vehicles, will begin utilizing RFID at its Portland, Ore., plant to help synchronize the timing of various points during production when critical components are pieced together.

Freightliner, a DaimlerChrysler company, will use active RFID tags operating in the 818 MHz to 915 MHz frequency range. Workers will affix tags to the truck cabs and metal frames, or chassis, so their locations and the exact times they arrive and leave those locations can be mapped throughout the production process.

Louis Fleischer

"In production, materials and major components and information flows have to be mapped, and a timeline, or sequence of events, must be orchestrated," says Louis Fleischer, plant automation engineer with Freightliner. "The comparison between the processing times gives you the ability to synchronize major components so they meet each other [on the production line] at the right time. The events are managed like a traffic light would manage traffic flow. With the RFID system, we can predict the impact on delivery [of the truck], or the impact on another stage in the production process."

After considering as many as 12 solutions featuring both passive and active tags, Freightliner opted to work with Cactus Commerce, a software and services company focused on supply-chain management, enterprise collaboration and integration, and e-commerce, and RFID hardware provider Identec Solutions.

Freightliner went with Cactus Commerce and Identec Solutions because the latter's RFID system operated well in the truck-maker's production environment, which includes a lot of heavy metal and "robotic welding that would interfere with a majority of tags and readers," Fleischer says. In addition, the tags had to provide a read distance of more than 100 feet. Freightliner required such a long read range because there are areas within the plant where things such as the robotic spot welders can interfere with the RF signal. To track assets in an area handling 10 chassis, for example, a read range of 210 feet would be required. "Identec Solutions provides the ability to read up to 300 feet with only one reader," says Fleischer. "It does not require a lot of expense for the active RFID infrastructure to read at this kind of distance."

As the cabs and chassis move through production and strategically placed interrogators throughout the assembly line read the RFID tags, the tags' unique ID numbers will help Freightliner determine where each cab and chassis is, along with the time of day the cab or chassis is at that location. Readers are positioned at each pool—a work area with processes grouped together to produce a family of parts or installation process, thus completing the cycle time of a particular production requirement. Each reader has four antennas that can be used and assigned to specific zones to determine location. A total of 12 readershave been deployed, and Freightliner is currently using 32 antennas, positioned throughout the plant.