B&B Electronics GW-7552 - Manual - Manual (Page 25)

GW-7552 PROFIBUS/MODBUS GATEWAY User Manual (Version 1.40, Apr/2012) PAGE: 25
3.3 Communication protocol transfer
In section 3.1 and 3.2, we can understand that data exchange is through DI、
DO、AI、AO memory space of the GW-7552 between Profibus master、
Modbus and the GW-7552. When the GW-7552 acts as a Modbus master device,
the data exchange runs continuously between Profibus master、Modbus and the
GW-7552, as shown in figure 26
、 27.
Figure 26 GW-7552 (master mode) communication protocol transfers