This is an old revision of the document!
Lookup
Lookups are very similar to enumerations - they translate one value into something more human-readable.
The major difference between the two is the number of different values they support. Enumerations are suited to smaller, simpler sets of values - for example, having less than 10 distinct values.
Lookups are different. When you define a lookup, you upload a lookup table containing the lookup value and the translation. This can have hundreds or even thousands of values.
This makes them very useful for looking up fault-codes and statuses.