Fanuc Keep Relay Parameters Exclusive | TOP · Checklist |
Temporarily shielding external alarms or bypassing sensors (like a faulty conveyor rotation sensor) during troubleshooting.
Altering keep relays without proper documentation can result in catastrophic mechanical crashes, voided warranties, or severe personal injury. Never Guess the Bit Function
Exclusive bits may ensure that a tool changer and a spindle cannot operate simultaneously.
FANUC CNC systems rely on Programmable Machine Control (PMC) to manage the interface between the CNC software and the physical machine tool. Within the PMC, Keep Relays (K-parameters) act as non-volatile internal switches. They allow field technicians and programmers to change machine behaviors, enable hidden options, or toggle specific safety logic without rewriting the underlying ladder program. fanuc keep relay parameters exclusive
Follow these steps to safely access and adjust K parameters.
— Restoring a full SRAM backup from one machine to another can corrupt exclusive K relay states, causing unexpected alarms or improper axis behavior.
KEEPRL screens, you gain control over exclusive machine features that can enhance efficiency or assist in maintenance. Always operate with caution when modifying these parameters. FANUC CNC systems rely on Programmable Machine Control
Two scenarios occur frequently:
Unlike D (Data) registers which can be temporary, or R (Internal Relay) bits which are volatile, K parameters are architectural . If one bit is changed, no other feature in the machine should use that same bit for a different purpose.
act as non-volatile memory bits that retain their state even after power is turned off. These are primarily used by machine tool builders to enable or disable specific machine options, such as chip conveyors or tool management features. "exclusive" Follow these steps to safely access and adjust K parameters
The underlying ladder logic dictates that these two bits are . If a technician forces both bits to 1 , the PMC logic will either execute a fault routine, generate a custom machine alarm (EX-alarm), or defaults to a safe state to prevent both spindles from trying to command conflicting gear ranges or rotation signals at once. Hard-Coded vs. Logic-Enforced Exclusivity
Builders use keep relays to "use or not use" specific machine units, such as enabling/disabling a chip conveyor, high-pressure coolant, or an automatic door. System Configuration: Certain keep relays (specifically
Understanding FANUC Keep Relay Parameters: Exclusive Functions and Configuration