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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 840D 61344 - Channel Block: Several tools are active
Alarm 61344 occurs when the SINUMERIK NCK detects multiple tools simultaneously active across different spindles during execution of measuring cycles (e.g., MEAS, MEAW, MEASA). The measuring cycle logic requires exclusive tool engagement; simultaneous tool selection violates the spindle coordination rules defined in MD10200 (Number of Spindles) and tool management parameters.
61344
Siemens 840D 61344 - Channel Block: Several tools are active
Channel Block: Several tools are active
Siemens SINUMERIK alarm 61344: Channel Block: Several tools are active. This alarm indicates a fault or error condition on the SINUMERIK 840D control. Refer to the Siemens SINUMERIK alarm documentation for the complete description and remedy.
Root Cause Summary
Alarm 61344 occurs when the SINUMERIK NCK detects multiple tools simultaneously active across different spindles during execution of measuring cycles (e.g., MEAS, MEAW, MEASA). The measuring cycle logic requires exclusive tool engagement; simultaneous tool selection violates the spindle coordination rules defined in MD10200 (Number of Spindles) and tool management parameters.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
In the NC program, verify all MEAS/MEAW/MEASA cycles are preceded by a tool release command (M5 or explicit tool deselection via T0) on all inactive spindles. Check the program listing via Diagnostics > Program > Block View.
- 2
Confirm spindle coupling mode: Navigate to Diagnostics > Spindle > Spindle Status and verify that secondary spindles show T=0 (no tool) before the measuring cycle executes on the primary spindle.
Do not run the program in automatic mode until verified; execute in single-block (JOG) mode first.
- 3
Review MD10110 (Spindle Sync Mode) and MD10111 (Spindle Coupling Type) parameters. If master-slave spindle coupling is enabled, ensure the measuring cycle command explicitly releases the slave spindle tool via synchronized M5 instruction before MEAS execution.
- 4
Add explicit tool deselection in the program: insert 'T0 M6' (or equivalent) on all secondary spindles immediately before the MEAS block. Verify in Diagnostics > NCK > Tool Management that tool counters reset to zero.
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