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Heidenhain Controller
Tool · Intermediate · 30-120 minutes
HEIDENHAIN 603-0281 - Tool position unknown! Position tool.
Alarm 603-0281 occurs when the TNC control has longitudinal cutting limits defined but lacks valid position coordinates for the active tool. This typically happens after power-up, tool changes, or when tool position data is corrupted in the tool table.
HEIDENHAIN 603-0281 - Tool position unknown! Position tool.
Tool position unknown! Position tool.
This error condition indicates tool position unknown! position tool. The control has detected an issue that requires attention before normal operation can resume.
Root Cause Summary
Alarm 603-0281 occurs when the TNC control has longitudinal cutting limits defined but lacks valid position coordinates for the active tool. This typically happens after power-up, tool changes, or when tool position data is corrupted in the tool table.
Safety
Causes and Fixes
Perform complete reference run
Execute reference run sequence for all axes using softkey REF or manual reference procedure in operating mode Manual.
Always complete reference run before any machining operations when longitudinal limits are defined
Position tool to known location
Manually jog tool to a safe, known position and execute M0 or program stop to establish current coordinates.
Ensure adequate clearance from workpiece and fixtures during manual positioning
Update tool position in TNC
Use TOOL CALL function or execute T tool number M6 to properly register tool position with the control system.
Verify position display
Check position display shows valid coordinates in all axes before continuing with program execution.
Call a technician if:
Prevention
Common Mistakes
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