The Rack numbers are available only in the Bar Coded Labels and hence are generated when you make the labels for the job on optimization.
You first need to select a label template, which has the rack field added in it, for making the labels.
Once, the rack field is available in the template, the Rack nos. generated by PLUS 2D will be displayed in the labels. A unique rack no. is generated for each part.
The used racks quantity are automatically updated in the Racks database on printing the labels.
E.g.: A1_23 means Rack type (name) A - 1st rack - slot 23
Labels generated for Parts on Rack Optimization
Note : Sometimes the rack no. won't be displayed, the possible reasons for this could be as given below
A rack in which the part can fit is not available or is currently in use.
The label template selected doesn't have the rack field in it.