NickMiller
Member
I am looking for any advice with a profibus network.
The system copmprise the following:-
Siemens S7 315 DP2 PLC, 4 Siemens TP270 screens,6 Lenze servo drives, various Murr remote IO nodes and 6 linear encoders.
The system was working fine until 2 days ago when all the TP screens stopped displaying data from the PLC and could not write back to the PLC.
Using the diagnostics on the S7 software the nodes appeared in a complete random pattern and other time the software would just not talk to the PLC over the profibus.
I disconnected all the screens and tried the system again but still no luck. Slowed the network down to 187.5kps without the screens attached and managed to see all the nodes at there correct address.
Re-connected the first screen the network would then work for a couple of seconds then the screen would disconnect, then a couple of seconds later re-connect, this then repeated.
Talked to tech support at Siemens tried all they offered still no luck.
Checked all the obvious like duplicate node addresses, bad connections, damaged cables, everthing looks OK.
The customer is now demanding an explanation of the problem as they condsider 30 minutes a major breakdown, this has been down 2 days.
Any advice or that may resolve this problem would be greatfully recieved.
The system copmprise the following:-
Siemens S7 315 DP2 PLC, 4 Siemens TP270 screens,6 Lenze servo drives, various Murr remote IO nodes and 6 linear encoders.
The system was working fine until 2 days ago when all the TP screens stopped displaying data from the PLC and could not write back to the PLC.
Using the diagnostics on the S7 software the nodes appeared in a complete random pattern and other time the software would just not talk to the PLC over the profibus.
I disconnected all the screens and tried the system again but still no luck. Slowed the network down to 187.5kps without the screens attached and managed to see all the nodes at there correct address.
Re-connected the first screen the network would then work for a couple of seconds then the screen would disconnect, then a couple of seconds later re-connect, this then repeated.
Talked to tech support at Siemens tried all they offered still no luck.
Checked all the obvious like duplicate node addresses, bad connections, damaged cables, everthing looks OK.
The customer is now demanding an explanation of the problem as they condsider 30 minutes a major breakdown, this has been down 2 days.
Any advice or that may resolve this problem would be greatfully recieved.