EPISODE · Jun 11, 2026 · 33 MIN
What OS Actually Runs Inside a Siemens PLC?
from My Weird Prompts
What's actually running inside a Programmable Logic Controller? The answer is far more complex than a simple "bare-metal" vs. "full OS" binary. This episode explores the surprising diversity of operating systems powering industrial automation — from Siemens' proprietary S7 firmware and the shift to Mentor Graphics' Nucleus RTOS in newer S7-1200/1500 controllers, to Rockwell's long-standing use of VxWorks, Beckhoff's radical Windows-based TwinCAT architecture, and the cautious emergence of Linux and Codesys. We trace the evolution from monolithic firmware blobs to modern RTOS kernels with memory protection, process isolation, and web servers — and examine the security tradeoffs of every approach. If you've ever wondered what's actually running on the factory floor, this one's for you.
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What OS Actually Runs Inside a Siemens PLC?
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