In regards to the ports here is abreak down.
S1-4 = Digital power bar and dosing pumps
S5-8 = Old style analogue power bars
L1L4 and onwards = 1-10V line ports used for dimmable interfacing for items such as LED effect sticks, Tunze pumps, dimmable ballasts, and others
Level port = 2 x level control interface for auto top off, auto water change, leak alarms.
Temp port = temperature input port
pH, redox cond port = self explanatory
P3 ports that are only on the Profilux 3
PAB ports x 2 = ALL PAB equipment such as new PAB power bars and expansion boxes.