Time synchronization of PLC in CSNS experimental control system

Traditionally, the architecture of control system in large physics experiment is based on PLC and DCS like EPICS. For the control information in controls system, its timestamp is marked in control computer after transferred from PLC to computer. This mode will introduce more time deviation in time stamp. In CSNS, we will use a new PLC from BECKHOFF which can provide real-time timestamp, and we can synchronize the time more accuracy in whole experiment using IEEE1588 protocol. In this paper, the time accuracy of this PLC is well study. And how to integrate this PLC into EPICS is also discussed. At last, we provide a possible application in CSNS.