What causes Siemens SINUMERIK alarm 4102?

Machine data was changed requiring acknowledgment or power cycle. System configuration change notification. Commissioning or service operation generated this notice. Axis or drive configuration change affecting machine data.

How do I fix Siemens SINUMERIK alarm 4102?

1. Read the complete notice text on the SINUMERIK screen. 2. If a power cycle is indicated, perform a controlled machine power off and restart. 3. If machine data backup is indicated, save the current machine data. 4. Acknowledge the notice and verify the system is operating correctly after the change. 5. Consult the machine commissioning engineer if the notice is unexpected.

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Siemens SINUMERIK Controller

System · Intermediate · 30-120 minutes

Alarm 4102

Siemens 840D 4102 - Default values for drive cycle times differ

Alarm 4102 occurs when the 611D external drive modules and the CCU3 internal control unit have mismatched cycle time parameters for current control (MD32100) and speed control (MD32110). This parameter mismatch prevents synchronized commutation and velocity loop execution between the distributed drive electronics and the central control unit.

Siemens SINUMERIKSystemIntermediate30-120 minutes

4102

Siemens 840D 4102 - Default values for drive cycle times differ

Default values for drive cycle times differ

Root Cause Summary

Alarm 4102 occurs when the 611D external drive modules and the CCU3 internal control unit have mismatched cycle time parameters for current control (MD32100) and speed control (MD32110). This parameter mismatch prevents synchronized commutation and velocity loop execution between the distributed drive electronics and the central control unit.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Access Siemens SINUMERIK 840D HMI or SCOUT software. Navigate to Diagnostics > Drive/Axis > 611D Module Information to verify the current active values for MD32100 and MD32110 on each connected 611D module.
Do not perform this check during active machine operation or with servo drives enabled.
2
Cross-reference 611D module parameters against CCU3 system machine data. In SCOUT, open the NCK project and check MD32100 and MD32110 values in the Drive Parameters menu. Document all mismatches.
3
If mismatch confirmed: Power down the system completely (24VDC and 400VAC). Remove the affected 611D module(s) from the cabinet. Use Siemens service tool or FEPROM programmer to reload default parameters matching your CCU3 configuration, or reprogram the 611D EEPROM with unified cycle time values.
FEPROM reprogramming requires specialized equipment and Siemens training. Contact Siemens service support if unsure.
4
Reinstall the 611D module and power up system. Verify alarm clears by checking HMI alarm list. Perform a warm restart of the control unit to confirm parameter synchronization is persistent.

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