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Some experiment concepts require a control system with the individual components working synchronously. At PSI the control system for X-ray experiments is distributed in several VME crates, on several EPICS soft ioc servers and linux nodes, which need to be synchronized. The timing network using fibre optics, separated from standard network based on TCP/IP protocol, is used for distributing of time stamps and timing events. The synchronization of all control components and data acquisition systems has to be done automatically with sufficient accuracy and is done by event distribution and/or by synchronization by I/O trigger devices. Data acquisition is synchronized by hardware triggers either produced by sequences in event generator or by motors in case of on-the-fly scans. Some detectors like EIGER with acquisition rate close to 20kHz, fast BPMs connected to current measuring devices like picoammmeters with sampling frequences up to 26 kHz and photodiodes are integrated to measure beam properties and radiation exposures. The measured data are stored on various file servers situated within one BL subnetwork. In this paper we describe a concept for implementing such a system.
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