What precisely happens in the event of online changes? What program is changed?
This method allows changes while the PLC is running. In the event of on-line changes, the delta code – i.e. the last changes – is generated and this code is loaded into the controller (into the run time system) after login and is stored there. If you now wish to activate the changes, the code is “appended” at the end of the currently running cycle. As the code now exists twice, the memory is reorganised during the next cycles (garbage collection).
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