Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Program/G-code · Intermediate · 30-120 minutes

Alarm 16772

Siemens 16772 - Block axis is the slave axis, the coupling is being opened

This alarm occurs when an axis is active as a slave in a coupling during REF operation mode, causing the coupling to open. It can be resolved by adjusting the program or suppressing the alarm via machine data.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

16772

Siemens 16772 - Block axis is the slave axis, the coupling is being opened

Block axis is the slave axis, the coupling is being opened

The axis is active as a following axis in a coupling. In REF operating mode, the coupling is opened. The alarm can be suppressed with MD11410 $MN_SUPPRESS_ALARM_MASK bit 29 = 1 or with CP programming by setting CPMALARM[FAx] bit 0 = 1 Control reaction: Alarm display.

Root Cause Summary

This alarm occurs when an axis is active as a slave in a coupling during REF operation mode, causing the coupling to open. It can be resolved by adjusting the program or suppressing the alarm via machine data.

Safety

  • Only qualified personnel should diagnose and clear control alarms; follow the machine builder's safety procedures and lockout/tagout where hardware work is required.

Causes and Fixes

  1. 1

    SAFETY: Lock out machine and consult documentation

    Ensure machine is in safe state before diagnostics. Review Siemens documentation for your specific controller version.

  2. 2

    Check program mode

    Verify if the program is running in REF operation mode at the alarmed block.

  3. 3

    Adjust program (technician recommended)

    Modify the program to avoid coupling operations in REF mode if possible. Consult technician for complex coupling scenarios.

  4. 4

    Suppress alarm (technician only)

    TECHNICIAN ONLY: Set machine data 11410 SUPPRESS_ALARM_MASK Bit29 = 1 only after confirming safety implications.

Service Recommendedmedium confidence

Call a technician if:

  • ·Before modifying any machine data parameters
  • ·If unfamiliar with Siemens coupling configurations
  • ·If the alarm persists after program adjustments
  • ·When machine data changes are unclear or restricted
  • ·Before suppressing any safety-related alarms

Prevention

  • Avoid coupling operations in REF mode unless necessary
  • Validate coupling configurations before running programs

Common Mistakes

  • Overlooking REF mode restrictions
  • Misinterpreting slave axis behavior in couplings

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Always verify with your machine manual or a certified technician before performing service procedures.