What causes Siemens SINUMERIK alarm 4150?

M function assigned in $MN_M_NO_FCT_CYCLE[n] is a reserved system M code that cannot be overridden by subprogram. Machine data parameter contains M function number outside valid range for subprogram substitution. Incorrect machine data configuration attempting to redirect a critical M function (such as M0, M1, M2, M30) through custom subprogram. Corrupted or manually edited machine data file with invalid M function reference. Mismatch between configured M function and channel capabilities in multi-channel configuration.

How do I fix Siemens SINUMERIK alarm 4150?

1. Access machine data editor and review $MN_M_NO_FCT_CYCLE[n] parameter to identify which M function number is causing the conflict 2. Consult the Siemens 840D/828D documentation to verify which M functions are reserved and cannot be substituted with subprograms 3. Remove or replace the invalid M function assignment with a valid M code that is not system-reserved (typically M20-M99 range depending on configuration) 4. Verify the subprogram name and path associated with the M function are correctly formatted and accessible to the control 5. Perform a machine data consistency check and reload configuration, then test the M function call in manual mode

Siemens SINUMERIK codes

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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-45 minutes

Alarm 4150

Siemens 840D 4150 - Channel invalid M function subprogram call configured

The machine data $MN_M_NO_FCT_CYCLE[n] or $MN_M_NO_FCT_CYCLE_PAR contains invalid configration data: An M function, which is used by the system and can not be replaced by a subprogram call has been specified in the machine data $MN_M_NO_FCT_CYCLE[n] for the configuration of the subprogram call via M

Siemens SINUMERIKServo/AxisIntermediate30-45 minutes

4150

Siemens 840D 4150 - Channel invalid M function subprogram call configured

Channel invalid M function subprogram call configured

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Common Causes

M function assigned in $MN_M_NO_FCT_CYCLE[n] is a reserved system M code that cannot be overridden by subprogram
Machine data parameter contains M function number outside valid range for subprogram substitution
Incorrect machine data configuration attempting to redirect a critical M function (such as M0, M1, M2, M30) through custom subprogram
Corrupted or manually edited machine data file with invalid M function reference
Mismatch between configured M function and channel capabilities in multi-channel configuration

Troubleshooting Steps

1Access machine data editor and review $MN_M_NO_FCT_CYCLE[n] parameter to identify which M function number is causing the conflict
2Consult the Siemens 840D/828D documentation to verify which M functions are reserved and cannot be substituted with subprograms
3Remove or replace the invalid M function assignment with a valid M code that is not system-reserved (typically M20-M99 range depending on configuration)
4Verify the subprogram name and path associated with the M function are correctly formatted and accessible to the control
5Perform a machine data consistency check and reload configuration, then test the M function call in manual mode

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