What causes Siemens SINUMERIK alarm 26110?

Parameter or machine data configuration error. Hardware fault on the NC or drive component. Part program error or illegal command. Communication fault between NC and drive or I/O modules. Software or firmware error requiring system restart.

How do I fix Siemens SINUMERIK alarm 26110?

1. Note the complete alarm text including any axis, channel, or block number values. 2. Check for related alarms active simultaneously in the SINUMERIK alarm list. 3. Power cycle the machine to clear transient faults. 4. Review the SINUMERIK machine data for parameters related to the alarm. 5. Consult the Siemens SINUMERIK alarm manual for alarm 26110 detailed remedy.

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Siemens SINUMERIK Controller

Overtravel/Limit · Intermediate · 30-120 minutes

Alarm 26110

Siemens 840D 26110 - Independent drive stop/retract triggered

Alarm 26110 indicates that an independent extended stop or retract command was issued on the drive bus, causing the affected axis drive to enter a protective state and reject all subsequent NC travel commands. This is a drive-level safety intervention that requires hardware reset to recover communication and command authority.

Siemens SINUMERIKOvertravel/LimitIntermediate30-120 minutes

26110

Siemens 840D 26110 - Independent drive stop/retract triggered

Independent drive stop/retract triggered

Root Cause Summary

Alarm 26110 indicates that an independent extended stop or retract command was issued on the drive bus, causing the affected axis drive to enter a protective state and reject all subsequent NC travel commands. This is a drive-level safety intervention that requires hardware reset to recover communication and command authority.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Check axis position against SoftLimit parameters: Navigate Diagnostics > Axes > [Axis] > Parameters and verify current actual position is within MD30200 (min) and MD30201 (max) ranges. If position violates limits, machine may have crashed or lost reference.
Do NOT attempt to override limits without verifying mechanical integrity.
2
Inspect hardware limit switches on the affected axis. Verify switch connectors at drive terminal block and check switch signal status in Diagnostics > Inputs > Digital Inputs. Look for intermittent or stuck limit signals.
Ensure machine is in safe state before manual axis movement testing.
3
Review following error data: Diagnostics > Axes > [Axis] > Actual Values. Compare actual position lag against MD32100 threshold. If lag is excessive, check servo parameter MD32110 (following error monitoring enable) and axis motor coupling for mechanical slip.
4
Execute hardware reset: Power cycle the CNC control by switching main contactor OFF for 10 seconds, then ON. Monitor drive initialization on Diagnostics > Drives panel until all axes show READY state. Attempt controlled axis jog to verify recovery.
Hardware reset will clear all non-persistent error logs. Document alarm details before reset.

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