ESS was hosting a workshop in collaboration with CERN, GSI, DESY, ITER, IFMIF, MAX IV, CEA-Saclay, INFN and Cosylab on 29th and 30th of August 2013, with about 50 participants, including 30 from outside ESS. About 30 presentations were given. The main focus was on PLC based interlock systems, however also fast interlock systems based on FPGAs were discussed.