aller

10:44 Jan 3, 2013 

@Tony..Thank you
For further context:
Louvoiement
Position fin de déplacement 152.000 mm
Vitesse de déplacement 400 Mm/mn
Temps d’attente en début de porté 1.0 s
Temps d’attente en fin de porté 1.0 s
Nombre d’aller/retour en ébauche 1
Nombre d’aller/retour en finition 1

22:24 Jan 2, 2013 

See this:
VMa_xxx Validation mouvement aller / avance / marche
VMr_xxx Validation mouvement retour / recul / arrêt

22:23 Jan 2, 2013 

A belt grinder for superfinishing. Well I doubt as per context, the three words are used but they means same "Action movement" contrary to Inverse movement, but since they have given options, I am confused...

22:15 Jan 2, 2013 

I fear this is something that will be impossible for any of us to answer without seeing the whole of your wider context, to try and find out just why a distinction is being made between these 3 terms.

It would, however, almost certainly help to know just what sort of equipment is involved here? You have set the field as "Automation & Robotics", but that covers all sorts of things, and I feel sure it would help to know just what kind of automated equipment we are dealing with here?