This talk gives an overview of the beam-synchronous data acquisition at SwissFEL injector test facility which is required for on-demand data collection to do correlation studies. I will show how we have achieved synchronous collection of the acquired data (EPICS channels) across separated IOCs with asistance of the event timing system and by using "only" the statndard EPICS records (no custom record/device support). The mechansim has been built into a generic IOC software application package which can be installed on any IOC equipped with an event receiver and and allows runtime configuration of most of parameters including channels to be collected etc.