Code 221-002B: No SQL column description for column %1 in table %2
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical No SQL column description for column %1 in table %2 alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
[Cause of error] The SQL server does not provide a column description for the given SQL table column. It could be that the corresponding table does not exist, is incorrect in syntax, or for some other reason cannot be opened from the SQL server. Or the table has no column with the given name. [Error correction] Ensure that the corresponding table exists and that it has the matching column. Then restart the control. The interpreter needs column descriptions - For all table columns for which you have configured bonds (over CfgSqlProperties, CfgTableBinding and CfgColumnBinding). - For all columns of some fundamental SQL tables, that are indispensable for the correct function of the system (e.g. tool table). 10/2023 [277]
Source: HEIDENHAIN NC Error Messages — TNC7/640/620/320/128, CNC PILOT 640, MANUALplus 620 (10/2023)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Heidenhain TNC Series CNC Alarms
Heidenhain controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 221-002B on the TNC Series CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Heidenhain's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4497 Heidenhain TNC Series CNC codes.
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