Fanuc Keep Relay Parameters Exclusive _hot_ Jun 2026

What makes them exclusive is that they are readable or writable by the part program (G-code). Standard CNC codes like G10 or system variables cannot modify a Keep Relay. They exist purely for the machine’s internal logic, making them a “private” communication channel between the machine builder and the maintenance engineer, bypassing the operator and the part programmer.

In Fanuc CNC systems, Keep Relays (K-parameters) are specific memory addresses that store binary (0 or 1) settings to control machine behavior or enable/disable PLC functions. Unlike standard NC parameters, Keep Relays are often defined by the Machine Tool Builder (MTB) fanuc keep relay parameters exclusive