Fanuc Keep Relay Parameters Exclusive Fix Jun 2026

Keep Relays (K-parameters) are software switches in the Programmable Machine Control (PMC) that maintain their state (ON/OFF) even after a power cycle. Unlike standard parameters, Keep Relays are "exclusive" because their functions are defined by the Machine Tool Builder (MTB) , not Fanuc itself. Custom Functions:

: If not properly secured, the ability to change these parameters could lead to unauthorized alterations, potentially disrupting operations. fanuc keep relay parameters exclusive

In Fanuc CNC systems, (identified as K parameters ) are non-volatile internal relays within the Programmable Machine Controller (PMC) that retain their state even after the machine is powered off. Keep Relays (K-parameters) are software switches in the

Reserved for core system functions, such as the safety circuit interface (e.g., K928.7 or K929.0). How to Access and Modify In Fanuc CNC systems, (identified as K parameters

From a maintenance perspective, Keep Relays offer an exclusive diagnostic benefit. Because they directly reflect the state of machine options and custom logic, a technician can quickly audit the machine’s configuration. For example, if a tool changer stalls, checking the relevant Keep Relay (e.g., "Arm cycle time enable") can reveal whether a custom timer has been disabled.

Changing these parameters requires cautious access to the PMC maintenance screens. Set the machine to MDI mode .