is a critical axis control setting that defines the positioning deviation limit while an axis is stopped . It acts as a safety threshold for the CNC system, monitoring the "lag" or "error" between where the control thinks the axis should be and where it actually is while at a standstill.
In a Fanuc CNC system, the difference between the commanded position and the actual position is called "following error" or "positional deviation".
Sets the limit for this error while the axis is moving (linked to Alarm 411).
If the measured deviation exceeds the value set in Parameter 1829, the machine triggers to prevent mechanical damage or unsafe operation. Core Function and Purpose