What causes Siemens SINUMERIK alarm 4011?

Invalid NC address letter used in machine data table (must be A, B, C, I, J, K, U, V, W, X, Y, Z with optional numerical extension). Special characters or spaces included in axis identifier definition. Numerical extension on NC address letter exceeds allowed format or contains invalid characters. Machine data table entry contains lowercase letters instead of required uppercase format. Duplicate or reserved identifier already assigned to another axis in the same channel.

How do I fix Siemens SINUMERIK alarm 4011?

1. Access the machine data editor and navigate to the channel-specific geometry axis and channel axis tables referenced in the alarm (%2[%3]) 2. Verify all axis identifiers use only uppercase NC address letters (A-Z subset: A, B, C, I, J, K, U, V, W, X, Y, Z) with optional numeric extension, removing any special characters, spaces, or lowercase entries 3. Check for duplicate identifier assignments across the axis tables and confirm each axis has a unique name 4. Review the complete syntax of the problematic machine data entry to ensure it matches the controller's expected format for your specific 840D/828D model variant 5. Save corrected machine data, perform a soft reset of the control system, and verify the alarm clears on next startup

Siemens SINUMERIK codes

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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 20-45 minutes

Alarm 4011

Siemens 840D 4011 - Channel invalid identifier used in machine data

When defining names in the channel-specific tables for geometry axes and channel axes, one of the following syntax rules for the identifier to be entered has been violated: - The identifier must be an NC address letter (A, B, C, I, J, K, U, V, W, X, Y, Z), possibly with a numerical extension (840D:

Siemens SINUMERIKServo/AxisIntermediate20-45 minutes

4011

Siemens 840D 4011 - Channel invalid identifier used in machine data

Channel invalid identifier used in machine data

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Common Causes

Invalid NC address letter used in machine data table (must be A, B, C, I, J, K, U, V, W, X, Y, Z with optional numerical extension)
Special characters or spaces included in axis identifier definition
Numerical extension on NC address letter exceeds allowed format or contains invalid characters
Machine data table entry contains lowercase letters instead of required uppercase format
Duplicate or reserved identifier already assigned to another axis in the same channel

Troubleshooting Steps

1Access the machine data editor and navigate to the channel-specific geometry axis and channel axis tables referenced in the alarm (%2[%3])
2Verify all axis identifiers use only uppercase NC address letters (A-Z subset: A, B, C, I, J, K, U, V, W, X, Y, Z) with optional numeric extension, removing any special characters, spaces, or lowercase entries
3Check for duplicate identifier assignments across the axis tables and confirm each axis has a unique name
4Review the complete syntax of the problematic machine data entry to ensure it matches the controller's expected format for your specific 840D/828D model variant
5Save corrected machine data, perform a soft reset of the control system, and verify the alarm clears on next startup

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