CODESYS - the IEC 61131-3 automation software

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PostPosted: Thu Oct 25, 2018 4:22 am 
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Joined: Fri May 11, 2018 1:18 am
Posts: 5
Hello,

i am looking for information about persistent variables. I made a program which declare some persistent variables. Everything work fine and when the device shutdown and restart, the variable are indeed persistent in the right way. When i change the program (not the PersistentVars) and upload the new program to the device, the persistent variables are not restored as expected : not always, depending on the modification i made to the programe.
I had try a lot a things but do not understand why when i made a change to the program, sometime the persistent variables restart from 0 (persistent lost) and sometime the persistent variables keep its latest value.

Does someone can help me understand if this behaviour is correct or not ?


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