SIMATIC S7, safety programming tool; STEP 7 Safety Advanced Combo; V21 / Distributed Safety V5.4; engineering software; floating license for 1 user; software, documentation and license key for download; Safety Advanced V21: class A, 2 languages (de, en), executable with TIA Portal V21 STEP 7 Professional V21; Distributed Safety V5.4 SP5: class A, 3 languages (de,en,fr), executable with STEP 7 V5.5 SP1 or higher; - - consignee email address required for delivery