Fanuc 366 Alarm

If you are standing in front of a CNC machine equipped with a Fanuc Series 0i, 16i, 18i, 21i, or 30i controller, few red text warnings are as frustrating as the (often displayed as "AL-366").

Fanuc 366 Alarm: Software Process Too Slow (Ladder Execution Overflow) fanuc 366 alarm

The machine builder used a SUB 23 (ROT) instruction (rotary table calculation) inside a Level 1 PMC rung. Every time the spindle encoder sent a pulse, the ROT instruction recalculated the entire position matrix. If you are standing in front of a