An AI Agent Programmed a Siemens S7-1500 Through an MCP Bridge — Here's the SCL and the Race Conditions It Caught

We gave an LLM agent an MCP server that drives TIA Portal via Openness, then asked it for a conveyor-sorting state machine in SCL. It added the CPU, validated the simulator, wrote the FB, and shipped 14 test cases — and refused three things it shouldn't own.