This post is an FYI regarding an issue we disovered in Logix v20.11 that may affect others. To date, I have found no tech note in Rockwell's knowledge base.
We shipped a 3 identical lines of equipment each with a 1756-L61 processor about a year ago. The equipment sat for some time before installation and the processors were stolen from the racks. Customer bought new processors and we flashed them with v20.11 and re-downloaded the programs.
Then we started getting major non-recoverable faults, type 01, code 60 several times per day per processor. Program would be completely lost from memory. We finally rolled back a previous version of the firmware (originally processors shipped with v17) and all the issues disappeared.
After duplicating this issue in my lab and working with Rockwell tech support on this issue, here is there latest response, "I don't believe you need to send us anything further at this time. Engineering was able to create the fault. We have to let Engineering figure out where the problem is."
It seems there is some sort of incompatibility between my .acd project file and v20.11. Not sure if v20.12 or processors other than the -L61 are affected. But if you are having issues similar to this, roll back to a previous version before wasting too much time on it!
We shipped a 3 identical lines of equipment each with a 1756-L61 processor about a year ago. The equipment sat for some time before installation and the processors were stolen from the racks. Customer bought new processors and we flashed them with v20.11 and re-downloaded the programs.
Then we started getting major non-recoverable faults, type 01, code 60 several times per day per processor. Program would be completely lost from memory. We finally rolled back a previous version of the firmware (originally processors shipped with v17) and all the issues disappeared.
After duplicating this issue in my lab and working with Rockwell tech support on this issue, here is there latest response, "I don't believe you need to send us anything further at this time. Engineering was able to create the fault. We have to let Engineering figure out where the problem is."
It seems there is some sort of incompatibility between my .acd project file and v20.11. Not sure if v20.12 or processors other than the -L61 are affected. But if you are having issues similar to this, roll back to a previous version before wasting too much time on it!
