What is retentive when its a UDT in a DB?

Hi,

if you use PLC data types in optimized DB you can only chose Retain or not retain for the whole datatype / tags.

Regards,

Towome

An alternative is to copy to a single retentive DB all tags from within the UDTs.  Then at startup, in OB100, copy the retained values to the proper UDT tags.

nothankstosiemens

I have addition to this but mine is with optimized DB's.

Siemens states you can turn on and off retain area with an optimized DB.

That doesn't seem to apply when you call a UDT in your DB.  It's an all or none again.

Only reason i can think is because Siemens considers it a structure.

This is defeats the purpose for me. Using a UDT for ease of change but only need sections retained to not exceed retentive memory limit.

Is there a way to choose what is retentive when its a UDT in a DB?

Using V15.1 upd 3 with a 1518 plc.

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Split from TIA V15, can't turn on retain option in separate DB address..