REXYGEN Community Forum

hubc

Member

Registered: 2016-09-05

Posts: 60

Storing variables in non-volatile memory

Hello,

Is there a way to store some variable values in none volatile memory?

Example:
Storing a set point value, that after power failure it will come back to the last value set.

Are trends and archives the answer?

Regards
Hubert

jaroslav_sobota

Administrator

Registered: 2015-10-27

Posts: 535

Re: Storing variables in non-volatile memory

Hi Hubert,
thanks for your question. Trends and archives are not the answer, these are "write-only".

The answer is the SGSLP function block, which does exactly what you need.

If you need additional information, I'll be happy to help.

Jaroslav

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Monarco HAT for Raspberry Pi - Lightweight I/O for monitoring, archiving and control.
Raspberry Pi in industrial automation!

hubc

Member

Registered: 2016-09-05

Posts: 60

Re: Storing variables in non-volatile memory

Hi Jaroslav,
thank you very much!

Unfortunately SGSLP is in ADVANCED licensing group

In case of any doubts about SGSLP I'll post my questions here.

Regards
Hubert

tomáš čechura

Administrator

Registered: 2016-02-22

Posts: 371

Re: Storing variables in non-volatile memory

Hi Hubert,

there is also one more possibility - you can use REXLANG function block to save and load value to / from text file.
See this example: REXLANG Reading values from file

Some more details can be found in this topic.

If you require any further information, let me know.

Cheers, Tomas

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Raspberry Pi as a miniature industrial PC. Analog and digital I/O, RS-485 and 1-Wire bus.

hubc

Member

Registered: 2016-09-05

Posts: 60

Re: Storing variables in non-volatile memory

Great
Tomas, thanks for this info!

Regards
Hubert