What causes Siemens SINUMERIK alarm 14770?

Multiple M functions programmed in the same NC block when only one is permitted. Multiple S functions programmed in the same NC block. Auxiliary function group limit exceeded due to user-defined function configuration. Incorrect auxiliary function syntax in the part program for the configured machine. Tool changer or spindle control function conflicts with other M codes in same block.

How do I fix Siemens SINUMERIK alarm 14770?

1. Review the NC block identified in alarm message and verify only one M function and one S function are programmed per block; separate conflicting functions into sequential blocks if necessary 2. Check machine parameter settings for auxiliary function group definitions and verify the configured maximum functions per block matches the part program requirements 3. Consult the machine tool builder documentation for auxiliary function restrictions specific to your 840D/828D configuration, particularly for tool changer and spindle control sequences 4. Edit the part program to distribute auxiliary functions across multiple blocks where grouped functions exceed permissible limits 5. Verify user-defined auxiliary function groups in the machine data are correctly configured and test the corrected program with dry run or single block mode

Siemens SINUMERIK codes

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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-45 minutes

Alarm 14770

Siemens 840D 14770 - Channel block auxiliary function programmed incorrectly

The permissible number of programmed auxiliary functions per NC block has been exceeded or more than one auxiliary function of the same auxiliary function group has been programmed (M and S function). In the user-defined auxiliary functions, the maximum number of auxiliary functions per group in the

Siemens SINUMERIKServo/AxisIntermediate30-45 minutes

14770

Siemens 840D 14770 - Channel block auxiliary function programmed incorrectly

Channel block auxiliary function programmed incorrectly

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Common Causes

Multiple M functions programmed in the same NC block when only one is permitted
Multiple S functions programmed in the same NC block
Auxiliary function group limit exceeded due to user-defined function configuration
Incorrect auxiliary function syntax in the part program for the configured machine
Tool changer or spindle control function conflicts with other M codes in same block

Troubleshooting Steps

1Review the NC block identified in alarm message and verify only one M function and one S function are programmed per block; separate conflicting functions into sequential blocks if necessary
2Check machine parameter settings for auxiliary function group definitions and verify the configured maximum functions per block matches the part program requirements
3Consult the machine tool builder documentation for auxiliary function restrictions specific to your 840D/828D configuration, particularly for tool changer and spindle control sequences
4Edit the part program to distribute auxiliary functions across multiple blocks where grouped functions exceed permissible limits
5Verify user-defined auxiliary function groups in the machine data are correctly configured and test the corrected program with dry run or single block mode

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