What causes Siemens SINUMERIK alarm 10880?

Excessive empty or non-contour blocks programmed between chamfer/radius operations. Machine data 20200 (CHFRND_MAXNUM_DUMMY_BLOCKS) set too low for the program structure. Rapid traverse or repositioning blocks inserted between contour segments intended for CHF/RND connection. G0 commands or tool change blocks interrupting the contour sequence between chamfer/radius blocks. Incorrect post-processor output generating unnecessary intermediate blocks.

How do I fix Siemens SINUMERIK alarm 10880?

1. Review the NC program around the specified block %2 in channel %1 to identify all blocks between contour elements marked for CHF or RND 2. Count the actual number of empty/non-contour blocks between the two traversing blocks and compare against machine data 20200 CHFRND_MAXNUM_DUMMY_BLOCKS setting 3. Access machine data 20200 and increase the CHFRND_MAXNUM_DUMMY_BLOCKS value to accommodate the program structure, or consolidate empty blocks in the NC code 4. Verify the post-processor or CAM output is not inserting unnecessary G0, G53, or other non-contour commands between contour blocks intended for chamfer/radius application 5. Test the modified program with a reduced feedrate in single-block mode to confirm the contour sequence and chamfer/radius application proceed without alarm

Siemens SINUMERIK codes

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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-60 minutes

Alarm 10880

Siemens 840D 10880 - Channel block too many empty blocks between two traversing

Between 2 blocks containing contour elements and which are to be joined with a chamfer or a radius (CHF, RND), more blocks without contour information have been programmed than provided for in the machine data 20200 CHFRND_MAXNUM_DUMMY_BLOCKS.

Siemens SINUMERIKServo/AxisIntermediate30-60 minutes

10880

Siemens 840D 10880 - Channel block too many empty blocks between two traversing

Channel block too many empty blocks between two traversing

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Common Causes

Excessive empty or non-contour blocks programmed between chamfer/radius operations
Machine data 20200 (CHFRND_MAXNUM_DUMMY_BLOCKS) set too low for the program structure
Rapid traverse or repositioning blocks inserted between contour segments intended for CHF/RND connection
G0 commands or tool change blocks interrupting the contour sequence between chamfer/radius blocks
Incorrect post-processor output generating unnecessary intermediate blocks

Troubleshooting Steps

1Review the NC program around the specified block %2 in channel %1 to identify all blocks between contour elements marked for CHF or RND
2Count the actual number of empty/non-contour blocks between the two traversing blocks and compare against machine data 20200 CHFRND_MAXNUM_DUMMY_BLOCKS setting
3Access machine data 20200 and increase the CHFRND_MAXNUM_DUMMY_BLOCKS value to accommodate the program structure, or consolidate empty blocks in the NC code
4Verify the post-processor or CAM output is not inserting unnecessary G0, G53, or other non-contour commands between contour blocks intended for chamfer/radius application
5Test the modified program with a reduced feedrate in single-block mode to confirm the contour sequence and chamfer/radius application proceed without alarm

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