Fanuc Keep Relay Parameters Exclusive Online

Keep relays differ from standard diagnostic bits because they retain their state—ON (1) or OFF (0)—even after the machine is powered down.

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. fanuc keep relay parameters exclusive

PMC Ladder → Reads Keep Relay State → Executes Logic → Controls Machine I/O Keep relays differ from standard diagnostic bits because

vary wildly between a Haas, a Doosan, or a Matsuura. You must refer to the Ladder Diagram if a tool changer stalls