What causes Siemens SINUMERIK alarm 10744?

Missing block with travel information after approach (WAB) block in NC program. No travel information block programmed before retraction block. Incomplete or missing tangent direction definition in WAB instruction. Program logic error where WAB block is not preceded or followed by valid motion blocks. Syntax error in WAB block parameters or missing axis movement specification.

How do I fix Siemens SINUMERIK alarm 10744?

1. Review the NC program around the indicated block number and verify WAB approach/retraction blocks have valid travel information blocks immediately before or after them 2. Confirm the WAB block is properly formatted with required direction parameters and that adjacent blocks contain valid axis movement commands (G0, G1, G2, G3, etc.) 3. Check program structure: ensure approach blocks are followed by tool path blocks and retraction blocks are preceded by tool path blocks with defined motion 4. Verify tangent direction values are correctly specified in the WAB instruction and match the machine kinematic configuration 5. Reload or recompile the NC program to clear any caching issues, then test with a simplified program segment containing only the WAB and surrounding motion blocks

Siemens SINUMERIK codes

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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 20-45 minutes

Alarm 10744

Siemens 840D 10744 - Channel block no valid WAB direction defined

The tangent direction for smooth approach or retraction is not defined. Possible causes: - In the program, no block with travel information follows the approach block. - Before a retraction block, no block with travel information has been programmed in a program. - The tangent to be used for WAB mot

Siemens SINUMERIKServo/AxisIntermediate20-45 minutes

10744

Siemens 840D 10744 - Channel block no valid WAB direction defined

Channel block no valid WAB direction defined

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Common Causes

Missing block with travel information after approach (WAB) block in NC program
No travel information block programmed before retraction block
Incomplete or missing tangent direction definition in WAB instruction
Program logic error where WAB block is not preceded or followed by valid motion blocks
Syntax error in WAB block parameters or missing axis movement specification

Troubleshooting Steps

1Review the NC program around the indicated block number and verify WAB approach/retraction blocks have valid travel information blocks immediately before or after them
2Confirm the WAB block is properly formatted with required direction parameters and that adjacent blocks contain valid axis movement commands (G0, G1, G2, G3, etc.)
3Check program structure: ensure approach blocks are followed by tool path blocks and retraction blocks are preceded by tool path blocks with defined motion
4Verify tangent direction values are correctly specified in the WAB instruction and match the machine kinematic configuration
5Reload or recompile the NC program to clear any caching issues, then test with a simplified program segment containing only the WAB and surrounding motion blocks

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