Fanuc 7115 Alarm May 2026

Rating: 2/5 Stars (for user friendliness) Severity: High (Machine Stop)

In the world of FANUC diagnostics, Alarm 7115 is notoriously vague. It is the CNC control’s way of saying, "I tried to move the axis, but something physically stopped me, and I don't know exactly what it is." fanuc 7115 alarm

It is not a simple "Overtravel" or "Servo Error." It is a Static Impulse Clamping Alarm. Essentially, the controller detected an external force or resistance while the axis was supposed to be stationary (clamped), or it detected resistance that prevented it from achieving a "clamp" state. Rating: 2/5 Stars (for user friendliness) Severity: High

The ladder logic file stored in the FANUC’s flash ROM or SRAM can become corrupted due to electrical noise, a dying battery, or a bad firmware update. When the CNC reads the ladder at boot-up or during runtime, it detects an invalid instruction or a missing END statement, triggering alarm 7115. The ladder logic file stored in the FANUC’s

If this alarm appeared immediately after a maintenance event (like a battery change or board swap), the parameters are the likely culprit.

There are three primary categories of causes for Alarm 7115:

Last month, a customer called with a 7115 alarm on their lathe. The line read G70 P100 Q200. The P and Q were fine. But I noticed the line before: G72.2. Their control had stock removal type II but not type III. Simply changing G72.2 to G72.1 (or removing the .2) solved the entire problem.