Fanuc Keep Relay Parameters Exclusive Jun 2026

K0012.1 = 1: Detachable 4th Axis indexer installed (Plugs and pressure switches monitored).

Understanding FANUC Keep Relay Parameters: Exclusive Functions and Configuration

Keep Relays (K-parameters) are a specialized type of internal memory bit used within the Programmable Machine Control (PMC)

Imagine a CNC machining center where:

: Reserved for advanced system-level Keep Relays controlling PMC functions, screen display modes, and operator permissions.

Consider a dual-spindle CNC lathe. The machine cannot safely operate in "Spindle 1 Mode" and "Spindle 2 Mode" simultaneously. To handle this, a PMC programmer will design an exclusive keep relay structure: : Spindle 1 Selection Active (1 = Yes, 0 = No) K0001.1 : Spindle 2 Selection Active (1 = Yes, 0 = No)

Temporarily shielding external alarms or bypassing sensors (like a faulty conveyor rotation sensor) during troubleshooting. fanuc keep relay parameters exclusive

In the context of (Programmable Machine Controller) maintenance, Keep Relay parameters

Unlike standard relays, Keep Relays "keep" their state (1 or 0) even after the machine is powered off. Bit-Level Logic:

These are reserved by FANUC for essential PMC and system-level functions, such as safety circuits, DCS (Dual Check Safety), or special NC functionalities. . The machine cannot safely operate in "Spindle 1

If you suspect a conflict, follow this procedure on the FANUC control:

before modifying any Keep Relay, especially within exclusive zones. Many users have learned that an incorrect Keep Relay change can disable the ladder diagram, rendering the machine inoperable. Backup procedures are essential before any changes.

of the cooling fans on the old Fanuc 0i-MC. Elias stared at the screen. The machine was "dead"—no alarms, no errors, just a stubborn refusal to start the spindle. Bit-Level Logic: These are reserved by FANUC for

Keep relays are specialized 8-bit registers—represented from bit 0 to bit 7—that store critical logic states. Because they are stored in non-volatile memory, they serve as the "permanent memory" for a machine's logic operations. These parameters are generally split into two categories:

Power cycle the CNC machine if required by the system or if the modified logic dictates a hard reboot. Best Practices and Troubleshooting