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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 26102 - Axis drive sign of life missing
Alarm 26102 indicates the NCK has lost cyclic communication with the specified axis drive module—the sign-of-life telegram is no longer being refreshed within the expected cycle time. This is a critical servo/spindle communication fault that prevents axis motion and requires immediate hardware or parameter verification.
26102
Siemens 26102 - Axis drive sign of life missing
Axis drive sign of life missing
For PROFIdrive only: The sign-of-life cell is no longer being updated by the drive Control reaction: Mode group not ready. The NC switches to follow-up mode. Channel not ready. NC Start disable in this channel. Axes of this channel must be re-referenced. Interface signals are set. Alarm display. NC Stop on alarm.
Root Cause Summary
Alarm 26102 indicates the NCK has lost cyclic communication with the specified axis drive module—the sign-of-life telegram is no longer being refreshed within the expected cycle time. This is a critical servo/spindle communication fault that prevents axis motion and requires immediate hardware or parameter verification.
Safety
- Drive/power/encoder circuit: hazardous voltages may remain in the DC link after power-off. Lock out / tag out, wait for discharge per the drive documentation, and use qualified personnel only.
Causes and Fixes
- 1
Power down the machine and inspect all DRIVE-CLiQ connectors (M23 or M12) on axis %2. Check for corrosion, bent pins, and secure seating.
Verify machine is de-energized before contact inspection.
- 2
In Siemens HMI Diagnostics menu, navigate to [Drives] > [Drive Status] and confirm drive %2 appears with valid status bit. If 'Not Present' is shown, reseat all connectors and reboot.
- 3
If intermittent, replace the DRIVE-CLiQ cable. Log serial number of affected drive and test with a known-good cable to isolate the fault.
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Always verify with your machine manual or a certified technician before performing service procedures.