GX Works2 and GX Developer Label Device Reassignment Technical Bulletin

This technical bulletin describes a symptom where labels may be reassigned to existing devices used in other programs after compiling all programs or adding/changing labels in GX Works2 or GX Developer, causing unsettled device values. It details the occurrence conditions and operations that trigger this issue, and advises checking the cause and following precautions before writing data to the programmable controller CPU or performing an online program change.