Rs485 Interface For The Fieldbus; Wiring The Terminal Strip In Compliance With Emc; Maximum Cable Length - Siemens SINAMICS G120XA Operating Instructions Manual

Wiring the terminal strip in compliance with EMC

● If you use shielded cables, then you must connect the shield to the mounting plate of the
control cabinet or with the shield support of the converter through a good electrical
connection and a large surface area.
Further information about EMC-compliant wiring is available on the Internet:
60612658)
● Use the shield connection plate of the Control Unit to connect the shield as strain relief.
4.2.8

RS485 interface for the fieldbus

Function description
Figure 4-15
The RS485 ports of the converter are short-circuit proof and isolated.
You must switch-in the bus-terminating resistor for the first and last nodes.
Table 4-10
Modbus RTU
1200 m
Further information
The precondition for error-free communications is that the first and last station are supplied with
power.
Communication is maintained if you withdraw individual slaves from the fieldbus without
interrupting the cable.
SINAMICS G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
EMC installation guideline
Mounting the shield connection kit (Page 49)
Connection with the fieldbus via RS485
Overview of the interfaces (Page 77)

Maximum cable length

(http://support.automation.siemens.com/WW/view/en/
USS
1200 m for a baud rate up to
38400 bit/s and maximum of 32
nodes
1000 m for a baud rate of 187500
bit/s and a maximum of 30 nodes
4.2 Control interfaces
BACnet MS/TP
1200 m
Wiring
101