Amiko_Phil
Member
Hi
I have some communication issues regarding a PLC and a couple of Drives. They are communicating on a Profibus network.
The PLC is a Siemens S7-300 (CPU314C-2 DP) Step-7
And 13 Drives Siemens MM440
Baud Rate = 1.5Mbps
Profile = Standard
Before the baud rate was setup to 12 Mbps and the profile was DP.
My problem is not consistent, it only seem to appear when the process is running. The connection is lost on a couple of my drive. The drive is faulting. I’m getting this error:
A070: No setpoints received from Profibus-DP communication board. Triggered by A702, A703, and A704. The telegram failure time set in P2040 has run out.
A702: The link to the profibus is interrupted.
A703: No setpoints or invalid setpoint are being received from the profibus master.
A704: At least one configured internode transmitter is not yet active, or has not has failed.
And its not always the same drive that is faulting. It could be one or it could be all of them. I did talk with the technical support guys from Siemens and they tried to help me out but I’m still getting the same problem.
The only way I can run profibus right now is by only having one drive on the network else its faulting.
I tried:
- To slow down the baud rate from 12 Mbps to 1.5 Mbps.
- Longer telegram failure time.
- Checked that all my setpoints were valid.
- Re-did the connection and connector.
- Re-did the grounding.
- Grounded with using the connector and tried also grounding outside the connector.
- Checked that my ground was in the specs.
I did not check the signal with a scope. I’m a little worried about EMC because the cables are running pretty close to the power (600V). But I’m at least 30 cm away from the power cables.
If you have any suggestion for me that would be really appreciated.
Thanks for your time.
Phil
I have some communication issues regarding a PLC and a couple of Drives. They are communicating on a Profibus network.
The PLC is a Siemens S7-300 (CPU314C-2 DP) Step-7
And 13 Drives Siemens MM440
Baud Rate = 1.5Mbps
Profile = Standard
Before the baud rate was setup to 12 Mbps and the profile was DP.
My problem is not consistent, it only seem to appear when the process is running. The connection is lost on a couple of my drive. The drive is faulting. I’m getting this error:
A070: No setpoints received from Profibus-DP communication board. Triggered by A702, A703, and A704. The telegram failure time set in P2040 has run out.
A702: The link to the profibus is interrupted.
A703: No setpoints or invalid setpoint are being received from the profibus master.
A704: At least one configured internode transmitter is not yet active, or has not has failed.
And its not always the same drive that is faulting. It could be one or it could be all of them. I did talk with the technical support guys from Siemens and they tried to help me out but I’m still getting the same problem.
The only way I can run profibus right now is by only having one drive on the network else its faulting.
I tried:
- To slow down the baud rate from 12 Mbps to 1.5 Mbps.
- Longer telegram failure time.
- Checked that all my setpoints were valid.
- Re-did the connection and connector.
- Re-did the grounding.
- Grounded with using the connector and tried also grounding outside the connector.
- Checked that my ground was in the specs.
I did not check the signal with a scope. I’m a little worried about EMC because the cables are running pretty close to the power (600V). But I’m at least 30 cm away from the power cables.
If you have any suggestion for me that would be really appreciated.
Thanks for your time.
Phil