Because the Profinet system is a real time system, the times for LatchIN and LatchOUT of the process data are synchronized, so that {HEAD ~ data} is exchanged on {TAIL ~ all Profinet devices} simultaneously 
is exchanged on
Because the Profinet system is a real time system , the times for LatchIN and LatchOUT of the process data are synchronized , so that { HEAD ~ data } is exchanged on { TAIL ~ all Profinet devices } simultaneously
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH