2 modbus data exchange – B&B Electronics GW-7552 - Manual User Manual

Page 22

Text mode
Original mode

GW-7552 PROFIBUS/MODBUS GATEWAY User Manual (Version 1.40, Apr/2012) PAGE: 22

Figure 20 the input data of Profibus master device receive from the GW-7552

3.2 Modbus data exchange

Modbus protocol belongs to Master-Slave communication and it uses query and
response message to arrive at data exchange and device control, as shown in
figure 21.

Figure 21 Data exchange between the Modbus devices and the GW-7552