A couple questions regarding retentive and persistent variables in Codesys v2.3 using the wago 750-841. Cannot seem to find any information in the manual or online.
When I declare var_global retain persistent and give it a preset value like :=4, and I change it in online mode, the value is saved when I'm logged in but not when i'm logged out.
Also, if I were to change the value offline, it will still show me the value that was changed online.
Where is this data stored in the plc and is there a way to access it through codesys? I need someone to explain how the whole retentive memory thing works.
thanks
Martino
When I declare var_global retain persistent and give it a preset value like :=4, and I change it in online mode, the value is saved when I'm logged in but not when i'm logged out.
Also, if I were to change the value offline, it will still show me the value that was changed online.
Where is this data stored in the plc and is there a way to access it through codesys? I need someone to explain how the whole retentive memory thing works.
thanks
Martino