27037

Access Diagnostics > Axis/Spindle > [Affected Axis] and note both axis designations (%1 and %2) and the duplicate PROFIsafe address (%3) from the alarm text.

In SINAMICS drive commissioning tool (e.g., STARTER or HMI terminal), navigate to drive parameter group P7430 (Safety-Related Parameters) or equivalent safety module configuration. Verify that the 'PROFIsafe Address' or 'CID/Safety Address' parameter differs between the two implicated axes.

Do not assume drive parameters are unique when axes were cloned or copied from a template.

Modify the PROFIsafe address of the second axis to a unique value not used by any other axis on the control system. Ensure the new address is within the valid range (typically 0–127 depending on protocol version).

Perform a complete drive parameter download (Commissioning > Download All Drive Data) and cold restart of the 840D control. Verify alarm 27037 no longer appears during axis readout.

In the SINUMERIK drive diagnostics, navigate to Diagnostics > Drive > [Drive Type] > Parameter Backup and verify the checksum or integrity status of the safety parameter block. Most SINAMICS drives display a 'Parameter Checksum Error' or similar diagnostic if NVRAM is corrupted.

Use the commissioning tool to perform a 'Restore Factory Defaults' or 'Clear Safety Parameters' operation on the affected drive(s), then re-download all drive parameters including the unique PROFIsafe address for each axis.

Restoring factory defaults will reset all drive tuning and safety settings; ensure you have a current backup of correct parameters before proceeding.

If the drive continues to report the same duplicate address after restoration, perform a firmware update to the latest stable SINUMERIK/SINAMICS version, as address read-back errors have been corrected in recent releases.

After firmware and parameter restoration, perform a full system test including SafeMC/TIA Portal safety validation to confirm PROFIsafe handshake is re-established with unique addresses.

Verify the physical PROFIBUS/PROFINET module or coupler addresses for each drive. Check the device configuration in TIA Portal > Project > Devices & Networks > [Coupler/Module] and confirm each terminal has a unique 'Station Address' or 'Device Name'.

Cross-reference the communication module's address with the drive's internal PROFIsafe address parameter (MD or p-number in drive). Ensure the control's axis-to-safety-address mapping (usually in the Safety Integrated configuration or Axis-to-Module assignment) does not inadvertently assign two axes to the same communication module/address pair.

If using manual DIP switch or jumper configuration on older SINAMICS modules, physically verify and correct the module address to be unique. Update the TIA Portal device tree to match hardware, then download the project.

Clear any cached device diagnostics in the 840D (Diagnostics > Clear Alarms) and perform a warm restart to re-enumerate all PROFIBUS/PROFINET safety modules and re-validate unique addresses.