But then... nothing.
15:47:32.100 - Enter Step 20 (DIP) 15:47:32.105 - Timer started: 45s 15:48:17.200 - Temp fault detected 15:48:17.205 - Exit Step 20 15:48:17.210 - Enter Step 99 (EMERGENCY_RETRACT) 15:48:21.400 - Acid level <5% 15:48:21.405 - Enter Step 0 (IDLE) The coil was perfect. The acid was safe. And Lena finally understood the power of SFC in CODESYS: codesys sfc example
This is how industrial programmers think. Not just "code that runs"—but . But then
The SFC was in with a coil halfway submerged. The acid was safe
Then she wrote a parallel :
The Pickle Paradox System: Industrial Pickling Line (Acid Bath for Steel Coils) Controller: CODESYS SoftPLC v3.5 SP20 Part 1: The Problem Engineer Lena Vasquez stared at the production log. Line 7, the steel coil pickling line, had just scrapped its third $40,000 coil of the week. The sequence: Load coil → Dip in HCl acid → Rinse → Dry → Unload .