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:
http://support.automation.siemens.com/WW/view/en/
● Use the shield connection plate of the Control Unit to connect the shield as strain relief.
Mounting the shield connection kit (Page 49)
4.2.8
RS485 interface for the fieldbus
Function description
0DVWHU
%XVWHUPLQDWLQJUHVLVWRU
21
21
2))
2))
Figure 4-15
Connection with the fieldbus via RS485
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.
Overview of the interfaces (Page 77)
Table 4-10
Maximum cable length
Modbus RTU
USS
BACnet MS/TP
1200 m
1200 m for a baud rate up to
38400 bit/s and maximum of 32
nodes
1200 m
1000 m for a baud rate of 187500
bit/s and a maximum of 30 nodes
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.
Wiring
4.2 Control interfaces
SINAMICS G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
101
Summary of Contents for SINAMICS G120XA
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