AC800F Export Variables no update
Good day;
We have a Freelance system (version 2013) with AC800F controllers and in two opportunities we have experimented a issue with the exchange variable between controllers. the variables that are sent, exported, to other controller are not update. The issue has been solved after to do a re-init (Power off- Power on) the controllers and do a "whole station". But I need a explain why it happen. The issue happen with analog and digital variables. In one case only a toggle of the controller was enough to solve the issue for the digital variables, but it didn't for analog ones. I think that the issue begin with a power fail in the controllers, but it doesn't explain why the variable communication between controller is not working properly.
We have a Freelance system (version 2013) with AC800F controllers and in two opportunities we have experimented a issue with the exchange variable between controllers. the variables that are sent, exported, to other controller are not update. The issue has been solved after to do a re-init (Power off- Power on) the controllers and do a "whole station". But I need a explain why it happen. The issue happen with analog and digital variables. In one case only a toggle of the controller was enough to solve the issue for the digital variables, but it didn't for analog ones. I think that the issue begin with a power fail in the controllers, but it doesn't explain why the variable communication between controller is not working properly.
Asked 14 days ago
Voted best answer
1
This seems a common issue. I had it twice and I know a case in one of the surrounding factories.
Of coarse I made support requests to ABB, but the results were not really satisfying.
At the first time the ABB support suspected the "load selected" function to be the root issue (that's why they removed this in 2013). They suggested "load whole station" to solve this issue, what I had already done.
The second time they suggested to just remove the buffer batteries and power cycle the faulty controller, but this failed due an unrelated reason. "Load while station" again...
I guess the secondary controller got it's latcom receive function corrupted somehow in the past, but no one note because it's the secondary and all is working fine.
Then we had a redundancy toggle and the error appears. If we do toggle back all is fine. If we toggle again the error appears again.
I would suggest you to write a support request to ABB. Maybe your case does lead them to find the real root of this dangerous issue.
Of coarse I made support requests to ABB, but the results were not really satisfying.
At the first time the ABB support suspected the "load selected" function to be the root issue (that's why they removed this in 2013). They suggested "load whole station" to solve this issue, what I had already done.
The second time they suggested to just remove the buffer batteries and power cycle the faulty controller, but this failed due an unrelated reason. "Load while station" again...
I guess the secondary controller got it's latcom receive function corrupted somehow in the past, but no one note because it's the secondary and all is working fine.
Then we had a redundancy toggle and the error appears. If we do toggle back all is fine. If we toggle again the error appears again.
I would suggest you to write a support request to ABB. Maybe your case does lead them to find the real root of this dangerous issue.
Answered 13 days ago
Answers
1
Hello
There is a Technical Bulletin 3BDD011838D0251 with the title "Freelance: Stop of Lateral Communication after cold start or redundancy fail over"
It describes your situation. Though it claims that the problem does not exist with versions higher than V8.1 it gives some good advice how the problem can be avoided and also names a Tool that can determine, whether your system has that hidden issue or not. I'm not sure that the tool works with newer Freelance versions. Let me check with R&D.
Which version are you running? Freelance 2013, 2013SP1 or Freelance 2016?
The Technical bulletin and the Tool are available in MyControlSystem, provided you have a valid Sentinel agreement. Let me know if you can download the bulletin.
There is a Technical Bulletin 3BDD011838D0251 with the title "Freelance: Stop of Lateral Communication after cold start or redundancy fail over"
It describes your situation. Though it claims that the problem does not exist with versions higher than V8.1 it gives some good advice how the problem can be avoided and also names a Tool that can determine, whether your system has that hidden issue or not. I'm not sure that the tool works with newer Freelance versions. Let me check with R&D.
Which version are you running? Freelance 2013, 2013SP1 or Freelance 2016?
The Technical bulletin and the Tool are available in MyControlSystem, provided you have a valid Sentinel agreement. Let me know if you can download the bulletin.
3BDD011838D02513BDD011838D02513BDD011838D0251
Add new comment