Back to the roots! Before obtaining PhD degree in the area of machine vision I designed automation systems. This year I "returned back to the roots" (for a shortwhile only) and designed a complete automation system controlling a MVR (mechanical vapour recompression) evaporator used for concentrating whey permeate. The PLC used controlling the evaporator is a Siemens S7 CPU 315-2 PN/DP with more than 200 inputs/outputs. OIU used for controlling the system is a WinCC v7.3.