Xylem 205546 Modbus Communication Modules for Displays - Manual (Page 14)

14 EN 6.81 Modbus Communication Module 205546 Manual 1212
2.1.5.3 Three Connected Units and One Common Display
This example illustrates connection and ID configuration of for example three
MagFlux units without display, one common, remote display unit with a com-
munication module and a PLC unit.
GND
B
A
GND
GND RS485
Termination OFF ON GND GNDB
PCB no.: 510327-xxx
Communication RS485
3V3 5V5
5V
RTS
Rx Tx 3V3
GND
B
A
GND
GND
RS485
Termination OFF
ON
B
A
GND
PE
PLC
MagFlux #1
MagFlux #3
MagFlux #2
Display unit
with COM module
Figure 5. Three Connected Units and One Common Display Unit
Exampe ID settings
If Magflux #1 has ID=1 (seen from the com module), and the com module has
ID offset=100, the SRO Modbus ID is 101 (100 + 1) seen from the PLC.
Likewise the other MagFlux units with ID=2 and ID=3 would have the SRO
Modbus IDs 102 and 103.
Modbus Communication Modules