Fanuc Keep Relay Parameters Exclusive Fix Jun 2026

What specific are you trying to enable or change?

Scroll to the specific bit (0 through 7) reading from right to left.

Go back to the setting screen and set "PARAMETER WRITE" back to to remove the alarm.

This is the classic symptom of a .

These are reserved by FANUC for essential PMC and system-level functions, such as safety circuits, DCS (Dual Check Safety), or special NC functionalities. .

Machine builders use K parameters to provide optional features. For example, setting K17.2 can activate a probe function, while K3.2 can enable a 4th axis unclamp feature.

These system relays do not control the operation of an axis or a tool changer. Instead, they control the behavior of the PMC itself. If you modify a system keep relay, you are not changing a machine function; you are changing the programming environment of the control. Examples include: fanuc keep relay parameters exclusive

: Bypassing or enforcing safety interlocks, such as door locks or spindle start conditions.

(often labeled PMC or PMCMNT ) repeatedly until you see PMCLAD .

: Bypassing faulty sensors (such as a broken conveyor rotation sensor) to keep the machine running during diagnostics. What specific are you trying to enable or change

Press the softkey (or PMC MNT depending on the FANUC control series, such as 0i-F, 16i, or 31i). Select PMCPRM (PMC Parameter) or MNT -> K-RELAY .

Drop the entire circuit, treating the conflict as if no options are selected until the data is corrected. Common Applications for Exclusive Keep Relays

To help me provide more specific steps or details, could you tell me: This is the classic symptom of a

Note: For some advanced system relays, you may need to press the Emergency Stop button for the change to take effect. 4. Exclusive/Critical Keep Relay Examples