Справочник Пользователя для Mitsubishi Electronics FX5

22  LABELS
  

Label is identifier (character string) that specifies a character string in I/O data or internal processing. When a label is used in 
programming, a program can be created without being conscious about the device No.

*1 Label and device can be used in mixed manner.

For details on label, refer to the following.
MELSEC iQ-F FX5 Programming Manual (Program Design)