4050

Verify the source identifier exists by navigating to Diagnostics > NC > Code Table in the SINUMERIK control panel and confirming the old code name is listed.

Check MD10200 (NC code table) and MD10220 (additional user-defined codes) to confirm the source code is registered in the system.

Alarm will persist if the source identifier is not found in either parameter.

Review the part program or macro definition that triggered the rename operation; verify the syntax uses the correct identifier that exists in your configuration.

Identify the type classification of both the old and new identifiers in Diagnostics > System Info > NC Code Types, or reference your machine's NC code documentation table.

Verify the rename operation only occurs within the same type range. For example, rename G-code to G-code only; do not attempt to rename a Type 1 G-code to a Type 2 or reserved keyword range.

Crossing type boundaries is not permitted; choose an alternative identifier within the same type.

Check MD10210 (NC keyword range limits) and any custom macro parameter assignments (MD10220+) to ensure the target name falls within the correct functional type.

Review the part program or macro file where the rename was initiated; search for M118, code assignment, or MD parameter modification commands that reference the old and new identifiers.

Validate the syntax against SINUMERIK 840D programming guidelines (e.g., ensure identifiers use valid alphanumeric format without special characters, max length per system limits).

Syntax errors in macro definitions are not always clearly reported; verify against official SINUMERIK documentation.

Attempt the rename operation manually via HMI Diagnostics > Parameters > MD/SD to isolate whether the issue is program-based or configuration-based.