What causes Heidenhain alarm 905-2737?

Machine configuration parameter error related to the alarm function. Hardware component failure on the TNC control or connected module. Part program command or sequence not compatible with current machine state. Communication or interface fault between TNC and machine components. Machine tool builder specific configuration issue.

How do I fix Heidenhain alarm 905-2737?

1. Note the complete alarm text displayed on the TNC screen including any parameter values. 2. Check the Heidenhain NC error message manual for alarm 905-2737 for the specific remedy. 3. Power cycle the machine to clear transient faults. 4. Check for related alarms active simultaneously that may indicate the root cause. 5. Contact Heidenhain service or the machine tool builder if the alarm persists.

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Heidenhain Controller

Spindle · Intermediate · 30-120 minutes

Alarm 905-2737

Heidenhain 905-2737 - Tool number (T0 - T9)

HEIDENHAIN alarm 905-2737 indicates an invalid tool number specification in the T0-T9 range, typically occurring when the control encounters a tool number that conflicts with system parameters or exceeds configured limits. This alarm is directly related to tool management system configuration and spindle-related tool handling parameters.

HeidenhainSpindleIntermediate30-120 minutes

905-2737

Heidenhain 905-2737 - Tool number (T0 - T9)

Tool number (T0 - T9)

Root Cause Summary

HEIDENHAIN alarm 905-2737 indicates an invalid tool number specification in the T0-T9 range, typically occurring when the control encounters a tool number that conflicts with system parameters or exceeds configured limits. This alarm is directly related to tool management system configuration and spindle-related tool handling parameters.

Safety

Refer to Heidenhain service manual
Ensure qualified technician performs repairs

Causes and Fixes

1
Check machine parameter MP7260
Access MOD function, select machine parameters, navigate to MP7260 and verify the maximum tool number setting allows T0-T9 range.
MP7260 should typically be set to at least 9 or higher for basic tool operations
2
Verify tool table configuration
Press TOOL TABLE key, check if tool numbers T0-T9 are properly defined in the tool table with valid parameters.
Never modify tool table entries while spindle is running
3
Review program tool call syntax
Examine the NC program line causing the alarm and verify proper T-word syntax (e.g., T01 M06 instead of invalid formats).

DIY Feasiblehigh confidence

Call a technician if:

·Parameter changes don't resolve the issue
·Tool changer mechanical problems suspected
·Multiple related spindle alarms occur

Prevention

Maintain consistent tool numbering scheme
Regularly backup and verify machine parameters
Use proper NC program syntax validation

Common Mistakes

Assuming T0 is always available without checking parameters
Mixing tool number formats in the same program
Modifying tool parameters without understanding spindle configuration

Related Alarms

905-2738 905-2736 610 611

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