Fanuc Keep Relay Parameters Exclusive __link__ ✨

Two primary exclusive ranges exist:

Modern FANUC controls offer robust security to protect K parameters from unauthorized changes:

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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. fanuc keep relay parameters exclusive

If the signal to activate Option B is triggered, it passes through a normally closed contact of K0001.0 . If K0001.0 is already active, the circuit opens, and K0001.1 cannot turn on. Standard Interlocking Ladder Diagram Example

If K5.0 also secretly controls the chip conveyor direction, you have a non-exclusive parameter. This creates unpredictable machine states.

Because modifying a system K parameter can cause a controller to fail to boot, follow these golden rules: Two primary exclusive ranges exist: Modern FANUC controls

Press the right extension softkey ( > ) until you see (PMC Maintenance) or PMC . Press PMC MNT , then press the K-PARAM softkey.

: Values are stored in non-volatile memory, ensuring that settings like a chip conveyor's "on" status or safety bypasses persist after a restart.

To modify these parameters, you generally need to put the machine in and enable "Parameter Write". Can’t copy the link right now

Selects between different tool changer types (e.g., Rack vs. Umbrella). Spindle Safety

When looking at a Fanuc control screen under the PMC Parameter section, you will see a grid formatted like this: K0001 How to Read the Bits

Because keep relay assignments are determined by the Machine Tool Builder (MTB), their functions vary between machines. It is critical to consult the machine’s or Maintenance Manual provided by the manufacturer to identify what each specific K-address controls. Fanuc Keep Relay Parameters Overview | PDF - Scribd

Note: If the ladder logic enforces strict exclusivity, changing a bit via this screen may instantly force the opposite bit to 0 , or the system may reject the input if the interlocking conditions are not met. Safety and Best Practices