This function is valid for vial trays only.
Vial+ is used for sample vial locations only; it defines an offset from the current sample vial number. For example, if the current sample vial is 1, a value for Vial+ of 3 specifies a vial that is three positions away from the sample vial, in this case vial 4. The limits are independent of the sample tray configuration:
-99 to +99
Note: Vial+ may not be used with Overlapped Injection.