What causes Siemens SINUMERIK alarm 10206?

Parameter or machine data configuration error. Hardware fault on the NC or drive component. Part program error or illegal command. Communication fault between NC and drive or I/O modules. Software or firmware error requiring system restart.

How do I fix Siemens SINUMERIK alarm 10206?

1. Note the complete alarm text including any axis, channel, or block number values. 2. Check for related alarms active simultaneously in the SINUMERIK alarm list. 3. Power cycle the machine to clear transient faults. 4. Review the SINUMERIK machine data for parameters related to the alarm. 5. Consult the Siemens SINUMERIK alarm manual for alarm 10206 detailed remedy.

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Siemens SINUMERIK Controller

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

Alarm 10206

Siemens 840D 10206 - [up to SW 3.x only] Channel general error in function generator

Alarm 10206 indicates a general internal error within the function generator module of the specified channel on older Siemens 840D controls (SW version 3.x and earlier). This typically occurs due to corrupted NC program syntax, invalid function generator commands, or internal computational errors during polynomial/spline interpolation processing.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

10206

Siemens 840D 10206 - [up to SW 3.x only] Channel general error in function generator

[up to SW 3.x only] Channel general error in function generator

Root Cause Summary

Alarm 10206 indicates a general internal error within the function generator module of the specified channel on older Siemens 840D controls (SW version 3.x and earlier). This typically occurs due to corrupted NC program syntax, invalid function generator commands, or internal computational errors during polynomial/spline interpolation processing.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Identify the NC program block where the alarm occurred by checking the alarm display for line number and channel information.
2
Review the NC program around the fault location for function generator commands (FGROUP, FCUB, FPOL, FLIN) and verify syntax against programming manual for SW 3.x.
3
Check for missing closing statements (FGROUPEND), mismatched axis assignments, or invalid polynomial coefficients in the function generator block.
4
Correct the program syntax errors, retest with a single-block execution mode, and verify alarm clears before full production run.
Always backup the original NC program before making modifications.

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