Force saving cold retain values
This is what I tried:
- I've put in a CF card and set the Save cold retain values parameter on 1 minute.
- Called SaveColdRetain function. But get return status: -42
The only times that cold retain values are saved are when I go offline with Control Builder.
Values are saved every hour due to the automatically save cold retain option in the OPC server.
In general, I personally find the online help more useful than the Acrobat edition.
The actual saving can be initiated on demand from application code or by cyclic schedule (see setting above).
Saving of cold retain on CF is not supported for redundant controller.
The AC 800M OPC server can also save cold retain, but that is a complete different feature for the benefit of performing download w/o falling back to initital value.