Fanuc: 7115 Alarm __link__

If the Command Multiply Ratio (CMR) or Flexible Feed Gear (DMR) parameters are set incorrectly, the controller miscalculates how many encoder pulses equal one millimeter or inch of actual travel.

Ensure the feedback sensor (auxiliary contact) on the side of the contactor is functioning. 3. Inspect Spindle Motor and Cables Verify that the connections to the motor are secure.

This alarm is not a standard "crash" or "overload" alert. It is a or PMC (Programmable Machine Controller) configuration error. Ignoring it or simply hitting "Reset" rarely fixes the problem. fanuc 7115 alarm

Does it happen during ? (Likely a geometry or tool data error).

Access the system boot screen (holding the two rightmost softkeys during power-on). If the Command Multiply Ratio (CMR) or Flexible

Sudden power loss causes SRAM corruption. A line-interactive UPS for the control section (not the spindle drive) prevents write errors during brownouts.

A malfunctioning feedback system sends corrupted positioning data back to the FANUC Alpha i Servo Amplifier. Inspect Spindle Motor and Cables Verify that the

: Manually inspect the contactors for the spindle. Look for signs of burnt coils or mechanical jams that prevent them from pulling in.

| Step | Action | | :--- | :--- | | | Power off and on the CNC. Sometimes the alarm occurs due to a transient state. | | 2 | Manually jog the axis to the middle of its travel range, away from the decel dog. Then attempt reference return again. | | 3 | Check the deceleration dog (limit switch or proximity sensor). Ensure it is not stuck in the active (depressed) state when the axis is away from it. | | 4 | Monitor the decel dog signal on the PMC diagnostic screen: Typically X address (e.g., X9.0 for Z-axis). The signal should be 1 when the dog is not activated, and 0 when the axis is on the dog. If reversed, invert the signal logic in PMC or check wiring. | | 5 | Check Parameter 3004#5 (RCD) – Set to 1 to disable the direction check (temporary workaround only for testing). If alarm disappears, the root cause is a configuration or hardware direction issue. | | 6 | Check Parameter 1006#5 for the axis. If 0: reference return in + direction. If 1: reference return in – direction. Confirm this matches the physical decel dog placement and machine design. |

The signifies that the CNC side (the main processor) has detected an illegal, inconsistent, or corrupted data transfer request from the PMC side (the ladder logic), or that the I/O Link (a high-speed serial bus) has failed.