SIMATIC S7, S7-PLCSIM V5.4 Floating license for 1 user E-SW, SW and documentation on CD, license key on USB stick, class A, 5 languages (de, en, fr, es, it) from STEP7 V5.4 SP4 or SP5 or STEP7 V5.5 with or without SP1, WinXPProf, Win7 Prof/Ultimate, reference HW: PG/PC * Contents: set (1x CD + 1x USB) Simulation systems can effectively support the development of programs and their subsequent productive use. In the world of automation, a simulated test environment, including control and process, shortens commissioning times, for example, and thus reduces costs. By finding programming errors early and optimizing parts of the program early, the programs are already error-free and optimized for use in the system. When programs are changed, it is possible to test the program before it is loaded into the system controller. PLCSIM is an elementary component of STEP 7 Professional (TIA Portal).