Keep Relays control acceleration curves, damping gains, and backlash compensation for axes. These values are empirically tuned by the builder during factory acceptance tests. Making them exclusive prevents "tuning by guessing," which leads to poor surface finish or servo instability.
To modify these parameters, you generally need to put the machine in and enable "Parameter Write". fanuc keep relay parameters exclusive
Fanuc provides the hardware and core firmware, but the Machine Tool Builder (e.g., Haas, Mazak, DMG MORI, Doosan) defines the Keep Relay map. This means: Keep Relays control acceleration curves, damping gains, and
– Most Keep Relay changes require a full shutdown and restart to take effect, as the ladder scans them only during boot-up. Keep Relays control acceleration curves
: Bypassing or enforcing safety interlocks, such as door locks or spindle start conditions.