Siemens SINAMICS G120C USS/MB - Connecting the Inverter to PROFIBUS; Connecting the PROFIBUS Cable to the Inverter

4.9.10 Connecting the inverter to PROFIBUS
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The PROFIBUS DP interface has the following functions:
● Cyclic communication
● Acyclic communication
● Diagnostic alarms
General information on PROFIBUS DP can be found in the Internet:
● PROFIBUS user organization (
http://www.profibus.com/downloads/installation-guide/)
● Information about PROFIBUS DP (http://www.automation.siemens.com/net/html_76/
support/printkatalog.htm)
4.9.10.1 Connecting the PROFIBUS cable to the inverter
Procedure
To connect the inverter to a control via PROFIBUS DP, proceed as follows:
1. Integrate the inverter into the bus system (e.g. line topology) of the control using PROFIBUS
cables via socket X126.
Overview of the interfaces (Page 81)
The maximum permitted cable length to the previous station and the subsequent one is
100 m at a baud rate of 12 Mbit/s.
2. Externally supply the inverter with 24 VDC through terminals 31 and 32.
The external 24 V supply is only required if communications with the control should also
run when the line voltage is switched off.
You have now connected the inverter to the control using PROFIBUS DP.
Communication with the controller even when the supply voltage on the Power Module is
switched off
You must supply the Control Unit with 24 V DC at terminals 31 and 32 if you wish to maintain
communication with the control system when the line voltage is switched off.
In the case of brief interruptions of the 24 V power supply, the inverter may signal a fault without
communications with the control system being interrupted.
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Installing
4.9 Connecting the interfaces for the inverter control
SINAMICS G120C converter
108 Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF