Kkula
Browse Questions » Communication / Networks: 315 Multipoint interface Networking

About User

Amit Pandey

Questions Asked: 36.7K

Answers Given: 0

Statistics

Tags

0
  • Open
  • New
Amit Pandey
Asked:15 Jan 2026

Communication / Networks: 315 Multipoint interface Networking

Hello there,
We are working on a system using 315-2DP CPU, the DP port used for the profibus drive communication, whereas through MPI port we have running a PC-based HMI using CP5611 card in the PC, the connecting cable to this MPI port have6ES7972-0BB60-0XA0 connector on the \PLC side, we have another HMI TP277 when we connect this HMI through this MPI port we find the address conflict error, and when we remove the PC cable from the PLC using this connector (6ES7972-0BB60-0XA0) and directly connect the HMI TP277 to this MPI port it works fine, we want to know is there any limitation of MPI network, or we need something else to prevent this conflict error, we want to operate both HMIs using MPI network so is there any suggestion to do it ?
Kindly advise your valuable suggestions.
Regards.

#sosflex #Communication / Networks #siemens
1Answers 3Views 0Votes
0 Likes 0 Favourites 0 Followers 0 Comments
Answers(1)
Deleted Member Added an Answer on17 Jan 2026

Address Conflict on MPI Network - S7-315-2DP

Dear Customer,

You are encountering a common issue with MPI networks when multiple devices attempt to communicate simultaneously. The MPI protocol, particularly on older systems like the S7-315-2DP, has limitations in handling multiple active masters on a single MPI segment without proper configuration.

Root Cause: The address conflict arises because both the PC (via CP5611) and the TP277 HMI are attempting to act as MPI masters on the same port. MPI typically supports only one active master at a time without advanced configuration.

Suggestions & Solutions:

  • Use a Switch/Hub: The most reliable solution is to introduce an MPI/Profibus switch or hub. Connect the PC (CP5611) and the TP277 HMI to separate ports on the switch. This effectively creates two independent MPI segments.
  • Address Segmentation: If a switch is not feasible, carefully assign unique node addresses to each MPI device (PC and TP277). Ensure there is no overlap in the address range used by each device.
  • CP5611 Configuration: Verify the CP5611 configuration in the PC's software. Confirm it’s using a unique address and that it's not constantly broadcasting requests that interfere with the HMI.
  • Consider PROFIBUS: If possible, explore connecting the TP277 to the Profibus DP port. This would offload traffic from the MPI port and resolve the conflict.

Further Support: For detailed configuration guides and troubleshooting steps, please refer to the SiePortal knowledge base:

If you require further assistance, please provide your specific CP5611 configuration and the assigned addresses to both HMIs.

Sincerely,

Siemens Self Support

0
Add a comment