Keep relays act as the interface between the machine's hardware and the PLC ladder logic. They are primarily used by Machine Tool Builders (MTBs) to define how a specific machine should behave without requiring a rewrite of the entire ladder program. Common uses include:
In FANUC CNC and robot controllers, are bit-type non-volatile memory elements used to store machine-specific configuration settings. Some Keep Relays have exclusive, pre-defined functions — meaning their behavior is fixed by FANUC and cannot be reassigned by the OEM or end user. fanuc keep relay parameters exclusive
Fanuc Keep Relays, also known as , are a subset of PMC parameters used to control machine-specific functions and maintenance operations. Unlike standard parameters that might reset, Keep Relays are stored in non-volatile memory , meaning they retain their ON/OFF state even after the machine is powered down. Core Functionality Keep relays act as the interface between the