Presenter - Leon Grossman The Siemens platforms have always encouraged the use of modular, reusable, and object-oriented code. Last year, DMC expanded on those concepts by working with Siemens to release the Open Library. It is a library of many common industrial objects (drives, valves, analog, etc.) that has paired PLC function blocks with HMI faceplates for WinCC Comfort and Advanced. The Open Library has recently expanded to support WinCC OA and leverage the new object oriented CTRL++ language elements released in WinCC OA v3.15. These new WinCC OA objects directly support the PLC objects in the library and support single tag configuration just like their HMI-centric cousins. We will discuss the role of object-oriented design in, how to obtain the Open Library, and how to use this library in your projects.