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Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 840D 100162 - Caution: Marked line is write-protected!
SIEMENS alarm 100162 occurs when attempting to edit or modify a program line that has been marked as write-protected in the SINUMERIK system. This protection mechanism prevents accidental modification of critical program sections or locked NC programs.
100162
Siemens 840D 100162 - Caution: Marked line is write-protected!
Caution: Marked line is write-protected!
Siemens SINUMERIK operator message 100162: Caution: Marked line is write-protected!. This is an informational message from the SINUMERIK control indicating a system status or operation result that may require operator action.
Root Cause Summary
SIEMENS alarm 100162 occurs when attempting to edit or modify a program line that has been marked as write-protected in the SINUMERIK system. This protection mechanism prevents accidental modification of critical program sections or locked NC programs.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Access Program Manager
Navigate to HMI → Program Manager → Select the affected NC program to view line attributes.
- 2
Check line protection status
Highlight the marked line and press Properties softkey to view write protection status in line attributes dialog.
- 3
Remove write protection
If authorized, uncheck 'Write Protected' attribute in line properties or use system parameter MD11210 $MN_PROG_WRITE_PROTECT_MASK to modify protection settings.
Document the reason for removing protection for audit purposes
Call a technician if:
- ·System parameter changes required beyond user authorization level
- ·PLC program modifications needed
- ·Hardware memory protection issues
Prevention
- Establish clear program protection policies
- Document write protection reasons
- Train operators on proper program editing procedures
- Regular backup of critical programs
Common Mistakes
- Attempting to edit system programs directly
- Ignoring user authorization levels
- Bypassing PLC safety interlocks
- Not documenting protection changes
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