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Freebase(0.00 / 0 votes)Rate this definition: OSIsoft. OSIsoft, LLC is a worldwide manufacturer of Application software for real-time data infrastructure solutions, called the PI System. Founded in 1980, OSIsoft, LLC is privately held and headquartered in San Leandro, CA, with operations worldwide.
The Plant Information (PI) System is a set of software modules for plant-wide monitoring and analysis. Running on Windows NT, Unix, and OpenVMS machines, PI archives real-time data collected from industrial devices such as DCSs and PLCs. PI client programs on PCs allow data reporting and analysis.