To understand "Keep Relays," we must first look at the standard memory architecture of a FANUC CNC system.
A common annoyance is the machine stopping the spindle or axes when the door is opened during setup. fanuc keep relay parameters
, however, are non-volatile memory areas within the FANUC PMC (Programmable Machine Control). They are designed to retain their status (0 or 1) even when the main power to the machine is disconnected. To understand "Keep Relays," we must first look
However, with great power comes great responsibility. Never change a Keep Relay without: They are designed to retain their status (0
New technicians often confuse Keep Relays with other parameter types. Here is the distinction:
FANUC controls utilize battery-backed SRAM (Static Random Access Memory) for data retention. While standard Internal Relays (R) exist in working memory that clears on power-down, Keep Relays are mapped to a specific section of memory that is constantly powered by the CNC's backup batteries (typically Lithium batteries located on the main board or power supply unit).
Fanuc Keep Relays (often referred to as K Parameters or K-Coils) are non-volatile, bit-level memory elements used to configure machine-specific logic. Unlike system parameters (which control the CNC’s base behavior), Keep Relays are designed for the to enable/disable specific user functions, safety interlocks, or operational preferences.