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I found the MEMCPY, I guess that is the way to do it?

@twincontrols Thanks for your comment. "Clearing and filling" the array is done in one PLC cycle, so the LEDs are not turned on one by one.

@twincontrols My take on the challenge, made in ST in Siemens TIA. Feedback on code is appriciated... 🙂 - Jesper Thygesen