Network hosts typically have to poll the I/O server repeatedly in order to obtain remote sensor data over an Ethernet network. This white paper presents a new approach to IP-based data acquisition and control that is dramatically faster, more flexible, easier to configure, and easier to program for. For several decades, PC-based solutions have been widely used for data acquisition and control in industrial automation. Early implementations relied on expansion cards inside a PC to attach I/O devices such as sensors, switches, alarms, etc. However, this solution was not effective over long distances due to the inherent limitations of I/O signal transfer.
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