SIMATIC S7, safety programming tool STEP 7 Safety Advanced Combo V18 / Distributed Safety V5.4 engineering software floating license for 1 user software and documentation on DVD license key on USB flash drive Safety Advanced V18: class A, 2 languages (de, en), executable with TIA Portal V18 STEP 7 Professional V18 Distributed Safety V5.4 SP5: class A, 3 languages (de,en,fr), executable with STEP 7 V5.5 SP1 - - content: set (2x DVD + 1xUSB)