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Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 840D 100900 - Press Input key to select
Alarm 100900 is an informational message, not a fault condition. It appears when the control system requires operator input to make a selection between multiple options, typically during program execution, tool selection, or manual intervention scenarios where the CNC cannot proceed without human decision.
Siemens 840D 100900 - Press Input key to select
Press Input key to select
Siemens SINUMERIK operator message 100900: Press Input key to select. This is an informational message from the SINUMERIK control indicating a system status or operation result that may require operator action.
Root Cause Summary
Alarm 100900 is an informational message, not a fault condition. It appears when the control system requires operator input to make a selection between multiple options, typically during program execution, tool selection, or manual intervention scenarios where the CNC cannot proceed without human decision.
Safety
Causes and Fixes
Read the HMI screen carefully to identify what selection is being requested (tool number, coordinate system, offset, or other parameter).
Verify the correct option based on the current machining operation, workpiece setup, and program requirements.
Press the INPUT key on the machine control panel to confirm your selection.
Ensure the selected option is correct before confirming, as this will directly affect program execution and machining results.
Monitor the program execution to verify it continues correctly after input confirmation.
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