Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 20-45 minutes

Alarm 10747

Siemens 840D 10747 - Channel block retraction direction not defined for WAB

In a WAB retraction block with quarter circle or semi-circle (G248 or G348), the end point in the machining plane was not programmed, and either G143 or G140 without tool radius compensation is active.

Siemens SINUMERIKServo/AxisIntermediate20-45 minutes

10747

Siemens 840D 10747 - Channel block retraction direction not defined for WAB

Channel block retraction direction not defined for WAB

In a WAB retraction block with quarter circle or semi-circle (G248 or G348), the end point in the machining plane was not programmed, and either G143 or G140 without tool radius compensation is active.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • Missing end point coordinates in machining plane for WAB retraction block with G248 or G348
  • G143 or G140 active without tool radius compensation when quarter circle or semi-circle retraction geometry is specified
  • Incomplete block definition lacking required plane coordinates for arc-based retraction path
  • Tool radius compensation mode mismatch with WAB retraction block requirements

Troubleshooting Steps

  1. 1Verify WAB retraction block contains complete end point coordinates (X, Y, or U, V as applicable) in the active machining plane
  2. 2Check that tool radius compensation (G41/G42) is active if using G248 or G348 quarter circle or semi-circle retraction geometry
  3. 3Review active G-code state: confirm G143 or G140 and verify compatibility with programmed retraction direction geometry
  4. 4Edit NC program to add missing plane coordinates or activate appropriate tool radius compensation mode before WAB block
  5. 5Simulate program block execution in offline mode to validate retraction geometry definition before restart

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