Dear Friends;
We have a BOBST 1228 flexo printing machine having Siemens S7-300 PLC (6ES7 318-3EL01-0AB0) and Lenze 9300 and 9400 drives. The field I/Os, Drives and an HMI is connected with PLC via CANBUSS. There are four CANBUSS cables going from PLC to field. At one of those cables, 34 nodes are connected. The last node (#05) is a Siemens HMI where termination resistance is connected at connector.
We faced a problem which appeared during running of machine that Main PC showed a fault that node 05 (HMI) was disappeared while it was connected. We replaced that HMI with a brand new tested HMI but hence problem was there. We tested all the CANBUSS network and connector but all the things were OK. We guessed that some problem appeared in PLC program. OEM connected via VPN and they also diagnosed the same but they unable to resolved the issue and stated that as the program can not be downloaded via VPN into PLC (program is in a memory card). They will send a new memory card of PLC with updated program.
Now we are waiting for that memory card.
This is strange for me that what kind of problem appeared in PLC program that it is not detecting the Node 05. Second thing, why OEM is not able to detect the problem and then download the program in PLC via VPN while it is our normal practice with other machines where other OEMs can do the same very easily with Allen Bradley PLC.
Can anyone help me out to understand the issue?
We have a BOBST 1228 flexo printing machine having Siemens S7-300 PLC (6ES7 318-3EL01-0AB0) and Lenze 9300 and 9400 drives. The field I/Os, Drives and an HMI is connected with PLC via CANBUSS. There are four CANBUSS cables going from PLC to field. At one of those cables, 34 nodes are connected. The last node (#05) is a Siemens HMI where termination resistance is connected at connector.
We faced a problem which appeared during running of machine that Main PC showed a fault that node 05 (HMI) was disappeared while it was connected. We replaced that HMI with a brand new tested HMI but hence problem was there. We tested all the CANBUSS network and connector but all the things were OK. We guessed that some problem appeared in PLC program. OEM connected via VPN and they also diagnosed the same but they unable to resolved the issue and stated that as the program can not be downloaded via VPN into PLC (program is in a memory card). They will send a new memory card of PLC with updated program.
Now we are waiting for that memory card.
This is strange for me that what kind of problem appeared in PLC program that it is not detecting the Node 05. Second thing, why OEM is not able to detect the problem and then download the program in PLC via VPN while it is our normal practice with other machines where other OEMs can do the same very easily with Allen Bradley PLC.
Can anyone help me out to understand the issue?