Keep the CNC machine control power ON during replacement to avoid losing the grid home position. Remove the old battery cartridge. Install the new OEM FANUC battery pack. Verify the alarm clears from the screen. 4. Recover Lost Home Position (If Necessary)
| Common Cause Category | Typical Symptoms | Likely to Trigger 7115? | | -------------------- | -------------------------------------------------------------------------------- | ----------------------- | | I/O communication | “I/O LINK ALARM”, “PC‑104 ERROR” or “NO I/O DEVICE” on diagnostic screen | ✔ Very likely | | Peripheral device | Physical device (e.g., a sensor, switch, or valve) does not change state in the PMC | ✔ Very likely | | PMC logic timeout | A sequence started but never completed (e.g., tool arm stuck) | ✔ Very likely | | Power/EMI issues | Sporadic, non‑repeatable 7115 alarm that clears after a power cycle | ✔ Possible |
If the 7115 alarm occurred because the battery went completely dead while the machine was powered off, replacing the battery will clear the alarm, but you will likely face a follow-up alarm: .
If you see erratic or infinite values, manually reset them to 0 or execute a master reset program if provided by your Machine Tool Builder (MTB). Step 4: Clear the Manual Guide i Cache/Memory
Follow these steps in sequence to isolate and fix the 7115 alarm. Step 1: Identify the Context of the Alarm Note exactly when the alarm occurs.
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 but not type III. Simply changing G72.2 to G72.1 (or removing the .2 ) solved the entire problem.
: Another device on the network is using the same IP address as the robot or the target device.
