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Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 840D 101602 - Parameter value cannot be changed
Alarm 101602 occurs when attempting to modify a machine or setting parameter that is currently protected from write access. This protection is typically active during program execution, in certain operating modes, or when password/access level restrictions are in place. The parameter is locked to prevent unintended changes that could affect machine safety or operational integrity.
101602
Siemens 840D 101602 - Parameter value cannot be changed
Parameter value cannot be changed
Siemens SINUMERIK alarm 101602: Parameter value cannot be changed. This alarm indicates an error condition in the NC program or control configuration that must be resolved before the operation can continue.
Root Cause Summary
Alarm 101602 occurs when attempting to modify a machine or setting parameter that is currently protected from write access. This protection is typically active during program execution, in certain operating modes, or when password/access level restrictions are in place. The parameter is locked to prevent unintended changes that could affect machine safety or operational integrity.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Press RESET to cancel any active program execution and return to program stop state.
- 2
Switch machine to JOG or MDA mode from the mode selector panel.
- 3
Navigate to the parameter screen and attempt to modify the parameter again.
- 4
If successful, return to desired operating mode and verify machine functionality before resuming production.
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Always verify with your machine manual or a certified technician before performing service procedures.