Hello Priya,
the messages are exchanged via TCP/IP. There are incoming and outgoing telegrams.
Depending to the scenario you set up the MFS the logic for the movement control can be maintained in EWM (based on the settings you'd also use for normal warehouse moves) or, if the MFS is setup as blackbox, the logic is unknown to EWM and handled via PLC directly.
So the answer is...depends on your scenario. Please see the picture about existing telegrams.
Regards,
Christian