Festo CPX-FB6 Manual page 16

Contents and general safety instructions
Term/abbreviation
Status bits
VTSA
Tab. 0/2: CPX-specific or Interbus-specific terms and abbreviations
XIV
Significance
Internal inputs which supply coded common diagnostic messages.
Pneumatic modules/valve terminal type 44
Festo P.BE-CPX-FB6-EN en 1207c