AC800M download with cold retain values
Hello,
I have activated the automatic save of cold retain values in the AC800M OPC server.
I would like to download the applications to the controller, after a controller shutdown.
The applications should have the cold retain values from the automatically save of the OPC server.
How I can get sure, which cold retain values are used by the download?
Can I choose the cold retain values for the download?
I have activated the automatic save of cold retain values in the AC800M OPC server.
I would like to download the applications to the controller, after a controller shutdown.
The applications should have the cold retain values from the automatically save of the OPC server.
How I can get sure, which cold retain values are used by the download?
Can I choose the cold retain values for the download?
Asked 3 months ago
Answers
1
Hi
Control Builder help says:
Cold Restart
At a Cold Restart, variables without the attribute ColdRetain lose their values. Instead, they are given their initial values or base values. Variables specified using the attribute ColdRetain keep their values. Cold Restart is disabled if the application has been changed and Apply Changes is set to No in the Online with Download dialog box.
AFAIK only the latest Cold Retain Values are stored and downloaded.
BR
Control Builder help says:
Cold Restart
At a Cold Restart, variables without the attribute ColdRetain lose their values. Instead, they are given their initial values or base values. Variables specified using the attribute ColdRetain keep their values. Cold Restart is disabled if the application has been changed and Apply Changes is set to No in the Online with Download dialog box.
AFAIK only the latest Cold Retain Values are stored and downloaded.
BR
Answered 3 months ago
1
when you perform a download the application always make a refresh and fetches the latest cold retain values.
the control builder also save the values when you go offline and the opc server saves the values cyclically.
the control builder also save the values when you go offline and the opc server saves the values cyclically.
Answered 3 months ago
2
Hi,
Like the other answers says, you can not be sure which cold retain values are stored and where. At least I don't know that.
Basically it works fine, but based on my experience, you can't check which are the last valid values stored. Especially at empty project loading case.
I'm doing like that - after successful commissioning, store the most important values as an initial values for the cold retain variables. Even store that values as a documentation of the application. Not so important values (process values) are adjusted/limited in acceptable limits, so in case of empty project loading, the application can run in proper way. Usually, it is not an everyday task to load an empty project to the controller.
Like the other answers says, you can not be sure which cold retain values are stored and where. At least I don't know that.
Basically it works fine, but based on my experience, you can't check which are the last valid values stored. Especially at empty project loading case.
I'm doing like that - after successful commissioning, store the most important values as an initial values for the cold retain variables. Even store that values as a documentation of the application. Not so important values (process values) are adjusted/limited in acceptable limits, so in case of empty project loading, the application can run in proper way. Usually, it is not an everyday task to load an empty project to the controller.
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