What causes Siemens SINUMERIK alarm 16695?

Part program contains an illegal or unsupported command for the current machine configuration. Channel or axis configuration does not support the programmed function. Required machine option not enabled for the commanded function. Axis assignment or transformation configuration error. Program execution sequence error.

How do I fix Siemens SINUMERIK alarm 16695?

1. Identify the program block that triggered the alarm — note the channel and block number. 2. Review the commanded function against the SINUMERIK programming manual. 3. Check if the required machine option is enabled for this function. 4. Verify axis assignments and transformation settings are correct for the application. 5. Consult the Siemens SINUMERIK alarm manual for alarm 16695 specific remedy.

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Siemens SINUMERIK Controller

Spindle · Intermediate · 30-120 minutes

Alarm 16695

Siemens 840D 16695 - Channel block following axis/spindle status/instruction is

Alarm 16695 indicates an attempt to execute a spindle instruction that is incompatible with the current state of the generic coupling (GCODE spindle synchronization or axis coupling). The coupling status machine may be in IDLE, COUPLED, or ERROR state, and the issued command violates the state transition rules defined in MD 32200 series coupling parameters.

Siemens SINUMERIKSpindleIntermediate30-120 minutes

16695

Siemens 840D 16695 - Channel block following axis/spindle status/instruction is

Channel block following axis/spindle status/instruction is

Root Cause Summary

Alarm 16695 indicates an attempt to execute a spindle instruction that is incompatible with the current state of the generic coupling (GCODE spindle synchronization or axis coupling). The coupling status machine may be in IDLE, COUPLED, or ERROR state, and the issued command violates the state transition rules defined in MD 32200 series coupling parameters.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Navigate to Diagnostics > Spindle Parameters > Generic Coupling in SINUMERIK HMI or access MD 32210 and MD 32220 via machine parameter menu. Verify coupling is enabled (MD 32210 = 1) and review current coupling mode (MD 32220: 0=OFF, 1=SPEED_SYNC, 2=POSITION_SYNC).
Do not modify machine parameters during active program execution.
2
Check MD 32200 (Coupling control enable per spindle). Ensure the spindle referenced in the alarm (spindle %3) has coupling enabled. If MD 32200[spindle_number] = 0, the spindle coupling is disabled and no coupling instructions will be accepted.
3
Review the NC program logic around block %2. Verify the sequence of coupling commands respects state transitions: COUPLE can only follow IDLE state, UNCOUPLE from COUPLED state, and M19 (stop spindle) only from COUPLED or IDLE. Reorder or add conditional checks (IF statements) to ensure proper sequencing.
4
If using axis-to-spindle coupling, verify MD 37200-37220 (axis coupling parameters) are correctly configured and that the master axis/spindle reference is valid and in a state that permits coupling (not in error, not executing rapid moves incompatible with coupling).

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