Fanuc Keep Relay Parameters Exclusive [extra Quality] -

Press the SYSTEM button, then press the soft key PMC MAINT (or PMC MAINTENANCE).

The machine finally clicked. The bar feeder pushed, the parts catcher waited its turn, and the exclusivity was resolved without a single alarm. Elias turned PWE back to

: Typically used for machine sequence control defined by the OEM.

Exclusive Keep Relays are useless without a memory map. FANUC does not standardize these for machine builders. K10.0 might mean "Chip Conveyor Installed" on a Mori Seiki, but "High Pressure Coolant" on an Okuma. If you lose the electrical drawings or the PMC ladder printout, troubleshooting becomes a nightmare.

These are allocated by the Machine Tool Builder (MTB) — such as Doosan, Haas, Makino, Fanuc itself — to manage specific functions of the machine, such as: Enabling/Disabling the Door Lock Switch. Turning ON/OFF the Chip Conveyor. Selecting Automatic or Manual tailstock operation. Shielding external inputs (e.g., for troubleshooting). 3. How to Access and Change Keep Relays (Step-by-Step) fanuc keep relay parameters exclusive

Maintenance teams can use K relays to customize machine startup procedures, automatically bypass specific homing routines or preheat cycles as needed for specific job setups.

By understanding how to properly read and modify , you can significantly reduce downtime and customize machine performance to meet specific production requirements. If you're interested, I can:

If a keep relay resets to its original state after a power cycle, it is likely being "written" to by a coil in the PLC ladder. In such cases, the relay cannot be changed manually without editing the ladder itself.

These are exclusive to the machine tool builder. They are used to toggle specific options. A builder might use K15.7cap K 15.7 Press the SYSTEM button, then press the soft

During setup, an operator wants to run the spindle with the safety door open to watch a coolant nozzle. Solution: FANUC systems often use a Keep Relay like K13.1 to manage the door lock interlock. Setting K13.1 to 0 disables the door lock signal, allowing the machine to run without the door closed. This is a standard "Setup Mode" trick.

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K0020.5 = 1: Minimum Quantity Lubrication (MQL / Air-Oil Mist) active. Elias turned PWE back to : Typically used

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)

Conversely, their exclusivity creates a security boundary. Malicious or accidental modification of Keep Relays is one of the fastest ways to disable safety circuits. Hence, responsible machine manuals list Keep Relay changes as a "service-only" procedure, often requiring a manufacturer-provided unlock code. This elevates Keep Relays from mere parameters to .

To change a keep relay (e.g., turning a feature ON or OFF), follow these standard steps: How to Enable Parameter Write Enable (PWE) on a Fanuc CNC