Comsoft XPS - Figure 7: Combined Send- and Receive Request

Contents XPS/XPS-E User's Manual
22  COMSOFT
3.3 Send and Receive Data
It is generally possible in both modes to send and receive data simultaneously.
The request telegrams described in the previous chapters then have to be
completed only by the entries of the transmission command (transmission
command number, length of transmission data, data).
Please note that the data are only accepted and transmitted by the XPS/XPS-E
if the transmission command number in the
data_exchange.req telegram
to the XPS has changed.
TE
S 1 2
X1 5
TE
DP-Master Receive Buffer
XPS/XPS-E
DATA_EXCHANGE.REQ
DATA_EXCHANGE.RES
X = Receive Request Number
S = Status
PROFIBUS Data Traffic
XPS/XPS-E
SEN
Figure 7: Combined Send- and Receive Request