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Siemens SINUMERIK Controller
Servo/Axis · Basic · 10-20 minutes
Siemens 840D 61502 - Channel block: No tool offset active
The alarm can be triggered by the following grinding cycles: all grinding cycles Remedy: A tool number must be programmed
61502
Siemens 840D 61502 - Channel block: No tool offset active
Channel block: No tool offset active
The alarm can be triggered by the following grinding cycles: all grinding cycles Remedy: A tool number must be programmed
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Common Causes
- No tool offset was selected before executing the grinding cycle block
- Tool offset table is empty or corrupted for the specified tool number
- T-word (tool selection) command missing from NC program before grinding cycle call
- Active tool offset was cancelled or reset during program execution
- Incorrect syntax in tool offset call or tool number does not exist in offset library
Troubleshooting Steps
- 1Verify the NC program contains a valid T-word tool selection command before the grinding cycle block that triggered the alarm
- 2Check the tool offset table to confirm the selected tool number has defined offset values and is not empty
- 3Confirm tool offset activation by reviewing the tool offset management screen in the HMI and ensure offsets match the programmed tool number
- 4If using a subroutine or macro for the grinding cycle, trace the calling sequence to verify tool offset persists through all program levels
- 5Clear the alarm, re-select the correct tool offset, and restart the program from the beginning to ensure proper offset initialization
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