324 APPENDIX A Protocol Resources OPC FOUNDATION l The OPC Foundation is an organization that maintains the open specifica- tions of the OPC protocol, in an effort to standardize and ensure interoperabil- ity of process data communications. Their site includes the latest resources for OPC Classic, OPC UA, and OPC XI (.NET). It provides whitepapers, sample code, technical specifications and software development kits. The website also includes member directories and product lists, as well as technical support, webinars, and other resources (http://www.opcfoundation.org/). COMMON INDUSTRIAL PROTOCOL/ODVA l ODVA is an international association made of automation companies, which manages the development of DeviceNet, EtherNet/IP, CompoNet, and ControlNet protocols utilizing the Common Industrial Protocol (CIP). The ODVA website provides technical specifications, conformance testing policies, training and other resources. It also includes member and product directories