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One or multiple I/O packs are mounted on each module to digitize the sensor signal, run algorithms, and communicate with a separate controller containing the main processor. I/O packs have a local processor board that runs a real-time operating system and a data acquisition board that is unique to the specific I/O application. Local processors run algorithms at faster speeds than the overall control system, such as the regulation of servo valves performed within a servo module. Each I/O processor has a local temperature sensor accurate to ±2°C (±3.6 °F). Detection of an excessive temperature generates a diagnostic alarm and the logic is available in the database (signal space) to facilitate control action or unique process alarm messages. The temperature is continuously available in the database. I/O module features include: • Dual 100 MB Ethernet ports • 100 MB full-duplex ports • Online repair per I/O pack • Automatic reconfiguration • Accuracy is specified over full operating temperature • Internal temperature sensor • LEDs: - Power status and attention - Ethernet link-connected and communication-active - Application-specific • 28 V dc power • Internal solid-state circuit breaker and soft start A power supply provides a regulated 28 V dc power feed to each I/O pack. The negative side of the 28 V dc is grounded through the I/O pack metal enclosure and its mounting base. The positive side has solid-state circuit protection built into the I/O pack with a nominal 2 A trip point. Online repair is possible by removing the 28 V dc connector, replacing the I/O pack, and re-inserting the power connector. I/O packs are automatically reconfigured if the Auto-Reconfiguration feature is enabled.