GX Works3 Label Program FB Software Defect Technical Bulletin

This technical bulletin details a rare but critical software defect in GX Works3 (versions 1.001B to 1.005F) and iQ Works Ver.2 where using label programs with specific module FBs for simple motion and positioning modules can cause unintended program operation. The issue occurs when certain conditions are met involving structure definitions, bit-type array labels, and manual device assignments; affected users must upgrade to GX Works3 version 1.006G or later and reconvert all programs.