GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual
(Version 1.35, May/2017)
PAGE: 17
3. Communication protocol transfer theorem
3.1 PROFIBUS data exchange
The GW-7553-B / GW-7553-M is a PROFIBUS DP Slave device. The GW-7553-
B / GW-7553-M is first parameterized then configured and finally it goes into the
data exchange mode (
Figure 11
).
Figure 11 State machine of PROFIBUS DP Slave device
The GW-7553-B / GW-7553-M exchanges data cyclically between internal DI
、
DO
、
AI
、
AO data and PROFIBUS Master device in data exchange mode, as
shown in
Figure 12
.