The data carriers are available in 20, 30, and 50mm diameters, with each size avail-able in 40-bit read-only and 192-byte read/write versions. Data processor communications options include Interbus, Profibus and Devicenet. The system is designed to eliminate false data and increase overall dependability. Every data carrier is pre-screened during manufacturing to be within a certain bandwidth for assured data transfer. Moreover, during operation, the data carriers' real-time communication parameters are redundantly monitored to ensure reliable information.