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Siemens SINUMERIK Controller
Communication · Intermediate · 30-120 minutes
Siemens 840D 27253 - PROFIsafe: communication fault F master component, error
Alarm 27253 indicates a breakdown in PROFIsafe communication between the NCK (numerical control kernel) and PLC safety layer, or between the DP master and safety protocol stack. This fault prevents the F-master safety controller from receiving critical handshake confirmations, halting all motion until communication is restored.
27253
Siemens 840D 27253 - PROFIsafe: communication fault F master component, error
PROFIsafe: communication fault F master component, error
Siemens SINUMERIK alarm 27253: PROFIsafe: communication fault F master component, error. This alarm indicates a fault or error condition on the SINUMERIK 840D control. Refer to the Siemens SINUMERIK alarm documentation for the complete description and remedy.
Root Cause Summary
Alarm 27253 indicates a breakdown in PROFIsafe communication between the NCK (numerical control kernel) and PLC safety layer, or between the DP master and safety protocol stack. This fault prevents the F-master safety controller from receiving critical handshake confirmations, halting all motion until communication is restored.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Navigate to Diagnostics > System > Safety on the HMI. Verify that the PROFIsafe link status shows 'Active' and check the SPL interface diagnostics for timeout or protocol errors.
- 2
Check MD37100 (PROFIsafe enable) and MD37110 (F-master type) in NCK Parameters menu. Confirm these are set correctly and match the PLC safety configuration in OB40 (safety cycle).
Changing these parameters requires a full machine restart and PLC memory reset.
- 3
Inspect the PLC-NCK interface module (typically TIA Portal Safety Project > Safety Integrity Level settings) and verify DPM (DP Master) communication parameters. Look for cyclic timeout values in MD37200-37220 range.
- 4
Power-cycle the entire control system (CNC, PLC, and safety modules) for 30 seconds minimum. This forces a clean reinitiation of the SPL handshake protocol.
Ensure E-stop is active before power cycling.
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Always verify with your machine manual or a certified technician before performing service procedures.