Fanuc Keep Relay Parameters Exclusive Best Jun 2026

Scroll the soft keys to find (Keep Relay). Press it.

This is not a flaw; it is an exclusive design feature. Fanuc and machine tool builders intentionally sequester Keep Relays because changing them can alter safety logic, bypass limit switches, or fundamentally change the operational sequence of the machine. By making them exclusive to trained service technicians or advanced integrators, Fanuc prevents accidental toggling that could lead to crashes, injury, or non-compliant machine behavior. fanuc keep relay parameters exclusive

| Practice | Why It Matters | | :--- | :--- | | | Use Fanuc’s I/O screen to output the PMC parameters (including Keep Relays) to a memory card. | | Document Every Change | Create a log: Date, Address (e.g., K0012.3), Old Value, New Value, Reason. | | Never Trust Defaults | If you reload generic Fanuc parameters from a donor machine, you will overwrite the exclusive Keep Relays with the wrong ones. Always use the machine-specific backup. | | Know Your Access Level | Operator = View only. Maintenance = Change non-exclusive K values. OEM = Change exclusive locked K values via password. | | Use the PMC Ladder Search | To find what a Keep Relay does, go to PMCLAD , press SEARCH , enter the K address (e.g., K5.2 ). The ladder will highlight exactly where that bit is used. | Scroll the soft keys to find (Keep Relay)