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Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 840D 100514 - Stock removal DLL already started
SINUMERIK alarm 100514 occurs when the Stock Removal DLL (Dynamic Link Library) is already running and the system attempts to start it again. This typically happens during ShopMill/ShopTurn operations or when multiple machining cycles try to access the stock removal calculation functions simultaneously.
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Siemens 840D 100514 - Stock removal DLL already started
Stock removal DLL already started
Siemens SINUMERIK operator message 100514: Stock removal DLL already started. This is an informational message from the SINUMERIK control indicating a system status or operation result that may require operator action.
Root Cause Summary
SINUMERIK alarm 100514 occurs when the Stock Removal DLL (Dynamic Link Library) is already running and the system attempts to start it again. This typically happens during ShopMill/ShopTurn operations or when multiple machining cycles try to access the stock removal calculation functions simultaneously.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Check active machining programs
Navigate to HMI → Program Manager → Active Programs and verify only one ShopMill/ShopTurn program is running.
Use SINUMERIK Operate's program overview to see all active threads
- 2
Reset stock removal function
Press RESET key, then navigate to Machine → Reset → Stock Removal Reset to clear the DLL state.
Ensure workpiece position is safe before resetting
- 3
Restart single program
Select only one machining program and restart execution through Program → Start.
Check MD20734 $MC_REMOVE_STOCK_ACTIVE for stock removal status
Call a technician if:
- ·DLL file corruption confirmed
- ·NCK memory hardware issues
- ·Repeated failures after all resets
Prevention
- Always use proper program termination (M30/M02)
- Avoid running multiple ShopMill programs simultaneously
- Regular NCK memory defragmentation
- Maintain current software versions
Common Mistakes
- Forcing program stop without proper cycle completion
- Ignoring memory warnings before they cause DLL conflicts
- Not checking for background processes before starting new programs
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