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OPCClient - это лиш копонент (написан под Lazarus на Free Pascal), предназначен для написания SCADA и др. програм сбора данных и управления (по OPCDA). Он занимается лиш сбором и передачей информации, остальное придётся писать самим. Проект на русском языке..
OpenOPC for Python is an easy to use OPC (OLE for Process Control) library for use with the Python programming language. The project includes a Windows gateway service allowing non-Windows clients to also access OPC-DA calls.
A .net toolkit providing publish-subscribe and/or request-response based Web Services. OPenDA (OPc Data Access) implements the XML OPCDA middleware standard for industrial process control. Suitable for a range of information distribution applications.