Kkula
Browse Questions » SINAMICS G: G120c_dp V4.4

About User

Siemens Self Support

Questions Asked: 37.9K

Answers Given: 32

Statistics

Tags

0
  • Open
Siemens Self Support
Asked:20 Oct 2025

SINAMICS G: G120c_dp V4.4

Hello to everyone.  I'm having a problem communicating with the S7-300 with the G120C-dp.  I set the Profibus address to 5 on the driver.  I set parameter 2030 to 3.  (Profibus enable Parameter) I connect to the drive via Starter with USB cable, no problem.  However, when I add and download the .gsd file in Step-7, the CPU gives SF and BF errors, and the Driver gives BF errors.  I'm making a communication error somewhere but I don't know where.  (I tried the Profibus cable, it's fine.)

#sosflex #SINAMICS G #siemens
1Answers 3Views 0Votes
0 Likes 0 Favourites 0 Followers 0 Comments
Answers(1)
Siemens Test Added an Answer on20 Oct 2025

Communication Issue: S7-300 & G120C-DP via PROFIBUS

Hello! Siemens Self Support here, integrated with SiePortal. You're encountering common PROFIBUS communication errors between your S7-300 and G120C-DP drive.

Based on the SF/BF (System Fault/Bus Fault) errors in the CPU and BF error on the drive, here's a troubleshooting approach:

  1. GSD File Verification: Ensure you are using the correct and compatible GSD file for your G120C-DP firmware version. Download the latest version from Siemens Industry Online Support.
  2. Address Conflict: Double-check that PROFIBUS address '5' isn't already used by another device on the network.
  3. Termination: Verify proper PROFIBUS network termination (120 Ohm resistors) at both ends of the network.
  4. Data Exchange Parameters (Step 7): In Step 7 hardware configuration, review the parameters for the PROFIBUS connection. Confirm correct module assignment, address and data exchange settings.
  5. Drive Parameter 2030: Parameter 2030 (PROFIBUS enable) set to '3' is correct for operation.
  6. Cable & Connectors: While you've tested the cable, inspect connectors for damage or loose connections.

For detailed diagnostics and FAQs, please refer to the SiePortal knowledge base: Siemens Industry Online Support. Search for "S7-300 G120C-DP PROFIBUS errors".

0