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Value Persistence across power cycle [message #1849676]

Fri, 28 January 2022 23:36

Mitchell Flaherty

Messages: 8
Registered: December 2021

Junior Member

The customer for this project has a requirement that if power is lost, then when power comes back everything should resume as if nothing happened. For that, we would like to have all inputs and outputs to different functions persist even if power is lost.

Is it possible to configure the runtime in this way?

Also, in general, is there any way to automatically persist state between power cycles?

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Re: Value Persistence across power cycle [message #1849710 is a reply to message #1849676]

Sun, 30 January 2022 20:16

Alois Zoitl

Messages: 1585
Registered: January 2014

Senior Member

Currently this is not possible in 4diac FORTE. I also think it would not be as easy to generically implement that. Because AFAIK this would require some special power-fail interrupt and some place to write that data to. However with such infrastructure ready it should be possible to implement this functionality.

Another observation I often get when talking about power cycles is that being in the exact state for everything does not always make sense. Because you normally don't know how long the power cycle lasted and if the system you are controlling is still in the same state as when power went down. So aren't you anyhow needing some initialization routines that check the system on power up?

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