Code 280-049B: OEM macro is not defined
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical OEM macro is not defined 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] No macro is configured for this cycle. [Error correction] - In CfgSystemCycle, enter a key for the corresponding macro: - Cycle 238 requires a key with the name OEM_MACHSTAT_MEAS. - Simultaneous finishing with FreeTurn tools requries a key with the name OEM_FREETURN_SIMUL_ON and OEM_FREETURN_SIMUL_OFF. - Contact the machine tool builder.
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 280-049B 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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