Siemens SIRIUS 3RW5 - Page 64

Connecting
5.2 Fieldbus
SIRIUS 3RW5 Modbus communication module
64 Equipment Manual, 03/2020, A5E43676481002A/RS-AC/003
5.2.2 3RW5 Modbus RTU communication module
5.2.2.1 Connecting the bus connection cable
Requirements
● Mounted 3RW5 communication module
● Correctly stripped bus connection cable for Modbus RTU (Page 41)
● Cable tie
● Jumper (optional)
Note
Malfunctions caused by EMC interference
The purpose of shielding cables is to attenuate (dampe
n) magnetic, electrical or
electromagneti
c interference fields. Connect the cable shield of the fieldbus cable to system
ground with low impedance so that interference currents on the cable shield can b
e
conducted to ground.
Generally follow the instructio
ns in the EMC Guide (http://www.siemens.com/emc-guideline)
and implement the measures stated in it for shielding the cables and for connecting the
shield.
General structure and design
Half duplex (RS 485), twisted-pair operation with multiple nodes:
LT
Line Termination