Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-60 minutes

Alarm 14547

Siemens 840D 14547 - Channel block contour tool: checksum erroneous or not available

When machine date $MC_SHAPED_TOOL_CHECKSUM was set, no edge was found for which the tool length components and the tool radius equal the negative sum of the previous edges.

Siemens SINUMERIKServo/AxisIntermediate30-60 minutes

14547

Siemens 840D 14547 - Channel block contour tool: checksum erroneous or not available

Channel block contour tool: checksum erroneous or not available

When machine date $MC_SHAPED_TOOL_CHECKSUM was set, no edge was found for which the tool length components and the tool radius equal the negative sum of the previous edges.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • Contour tool definition data corrupted or incomplete during import
  • Tool length offset or radius values do not match expected negative sum calculation of previous edges
  • Checksum verification enabled but tool geometry parameters were modified without recalculating checksum
  • Tool table data mismatch between controller memory and NC program reference
  • Edge definition sequence missing or out of order in shaped tool configuration

Troubleshooting Steps

  1. 1Verify the contour tool definition in the tool table matches the NC program call; check tool length and radius components for all edges
  2. 2Recalculate and regenerate the checksum for the affected shaped tool using Siemens tool management software or HMI interface
  3. 3Review the tool geometry data to confirm each edge satisfies the negative sum constraint relative to previous edges
  4. 4Clear the tool table entry and reimport the contour tool definition from a known good backup or CAM system
  5. 5Disable $MC_SHAPED_TOOL_CHECKSUM validation temporarily to isolate whether the issue is data corruption or calculation error, then re-enable after correction

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