RESULTS OF THE OPC EVALUATION DONE WITHIN JCOP FOR THE CONTROL OF THE LHC EXPERIMENTS
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The construction of the LHC experiments’ control systems will require the integration of a wide range of COTS (Component Of The Shelf) and custom components: hardware such as instruments, controllers, fieldbuses and sensors as well as applications, for example, for operator control and visualization or for subsystems supervision. This integration may require a non-negligible effort if standard interfaces or integration mechanisms are not applied. OLE for Process Control (OPC) is a recently defined set of interfaces designed to allow Windows applications to access control data. OPC is based on Microsoft DCOM and is developed by the OPC foundation [1]. This paper presents the result of an evaluation done in the context of the Joint Controls Project (JCOP) [2]. The aim of this evaluation was to study the usability of OPC for the detector control of the LHC experiments. In particular it presents the benefit and limitations of the specifications, the availability of OPC compliant COTS and the usability of OPC development kits to develop applications accessing custom devices or non-Windows platforms.