Utilizes the Open User Communication (OUC) and the Open Development Kit (ODK) to run high-level language code (C/C++) easily alongside standard ladder logic. Summary of Migration Path Feature / Attribute Legacy System Modern System Software Controller SIMATIC WinAC RTX (V4.6 / 2010) SIMATIC S7-1500 Software Controller (CPU 1507S/1508S) Engineering Environment STEP 7 V5.x / WinCC flexible TIA Portal (Step 7 Professional) Real-time Mechanism IntervalZero RTX Extension Siemens Hardware Hypervisor Windows Dependency High (RTX runs inside OS framework) None (Independent execution)