PLUS+1 Software > General controls

How to save a STRING to NV?

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spittet:

--- Quote from: FluidPowerTom on September 02, 2020, 06:09:30 PM ---I'd be checking to see if STRING type variables will save as RETAIN variables in the Structured Text POU.  That'd be by far the easiest way.

--- End quote ---

I tried it and, unfortunately, it seems that a variable of String type cannot be set as "RETAIN" in ST. I got the following message in the "Compiler Messages" during compilation (that aborted) :


--- Code: ---st_SavedString_data has a non-basic type, and can therefore not be backed by Non-Volatile memory
--- End code ---

I joined the test project to this post

acmall:
See this post from Nilla about limited support for RETAIN: -
https://www.plus1forum.danfoss.com/index.php?topic=1157.msg3763#msg3763

Sergio-DEK:
I agree. Expanding the support for NV and RETAIN variables is long overdue.

macbahi:
Hi All,

I downloaded the program SaveStringNV and I modified.

It's working but the data it's not saved as in NV.
when the controller is off,  the SaveString data it's not saved .

Please are you finding a why to save string?

I need that to integrate a password in our program for customers. 

Thanks in advance for your help

With best regards

FluidPowerTom:
It sounds like the only way to do it with Danfoss hardware may be to set up an ASCII lookup table and actually save the values as number arrays.

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