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1. Introduction: What is WinAC RTX? SIMATIC WinAC RTX (Windows Automation Center Real-Time eXtended) is a software-based PLC that runs as a real-time task on a standard Windows PC. Unlike traditional hardware PLCs (e.g., S7-300/400), WinAC RTX uses the PC’s CPU and memory to execute the user program (logic, motion control, and communication).