The term "exclusive" is used because certain keep relays—particularly those in higher ranges like —are often reserved for specialized, system-specific functions defined by FANUC or the machine tool builder (e.g., Doosan, Mazak, Haas using Fanuc control). 1. System Keep Relays (
The control will flash a harmless "SW0100 PARAMETER WRITE ENABLE" alarm. Ignore this for now. Step 2: Navigate to the Keep Relays Press the hard key.
Scroll the soft keys to find (Keep Relay). Press it.
— Some exclusive K relays directly control emergency stop behavior or hardware interlocks. Changing them outside FANUC specifications can create hazardous conditions. fanuc keep relay parameters exclusive
— Restoring a full SRAM backup from one machine to another can corrupt exclusive K relay states, causing unexpected alarms or improper axis behavior.
To modify: Use the cursor keys to highlight the specific bit. Type 1 or 0 and press INPUT .
These are exclusive to the machine tool builder. They are used to toggle specific options. A builder might use K15.7cap K 15.7 The term "exclusive" is used because certain keep
: Typically reserved for the machine builder to customize operations like chuck clamping or turret rotation.
Change "PARAMETER WRITE" from to 1 . The machine will likely trigger an "ALM 100" (Parameter Write Enable) alarm, which is normal during this process. Access the Keep Relay Screen: Press the SYSTEM hard key.
FANUC CNC systems are the backbone of modern manufacturing. Within these sophisticated controls lies a critical yet often misunderstood class of parameters known as (K parameters). Keep relays are non-volatile, bit-based memory elements used within the Programmable Machine Controller (PMC)—the internal PLC that manages all auxiliary machine functions such as coolant pumps, tool changers, and safety interlocks. Ignore this for now
Selecting between different tool changer (ATC) recovery modes. Configuring specific M-code behaviors.
: Enabling or disabling hardware options like chip conveyors, coolant systems, or specific interlocks.
FANUC keep relay parameters (K parameters) provide essential configuration flexibility, enabling everything from minor operator preference toggles to major machine behavior control. The "exclusive" nature of the K17–K19 and K900–K927 ranges means certain functions are reserved strictly for system-level management.
In PMC ladder design, refers to a control scheme where two or more Keep Relay bits must never be active simultaneously. If both bits are set to 1 at the same time, it creates conflicting instructions within the PLC ladder, leading to unpredictable machine behavior, hang-ups, or severe structural collisions. Why Exclusivity Matters
After changes, return the setting to 0 to prevent accidental modifications. Common Exclusive Use Examples Get to know how to change the Keep Relay!
