Code 201043: <location>Fatal error at project download
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Fatal error at project download 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
Message value: Fault cause: %1 Drive object: All objects Reaction: A_INFEED: OFF2 (OFF1) SERVO: OFF2 (OFF1, OFF3) VECTOR: OFF2 (OFF1, OFF3) Acknowledge: IMMEDIATELY Cause: A fatal error was detected when downloading a project using the commissioning software. Fault value (r0949, interpret decimal): 1: Device status cannot be changed to Device Download (drive object ON?). 2: Incorrect drive object number. 3: A drive object that has al ready been deleted is deleted again. 4: Deleting of a drive object that has already been registered for generation. 5: Deleting a drive object that does not exist. 6: Generating an undeleted drive object that already existed. 7: Regenerating a drive object al ready registered for generation. 8: Maximum number of drive objec ts that can be generated exceeded. 9: Error while generating a device drive object. 10: Error while generating target topology parameters (p9902 and p9903). 11: Error while generating a dr ive object (global component). 12: Error while generating a drive object (drive component). 13: Unknown drive object type. 14: Drive status cannot be changed to Ready (p0947 and p0949). 15: Drive status cannot be changed to Drive Download. 16: Device status cannot be changed to Ready. SINAMICS-Alarms Diagnostics Manual (DAsl), 03/2009 17: It is not possible to download the topology. T he component wiring should be checked, taking into account the various messages/signals. 18: A new download is only possible if the factor y settings are restored for the drive unit. 19: The slot for the option module has been configured several times (e.g. CAN and COMM BOARD) 20: The configuration is inconsistent (e.g. CAN for Control Un it, however no CAN configured for drive objects A_INF, SERVO or VECTOR ). Remedy: - use the current version of the commissioning software. - modify the offline project and carry out a new download (e.g. compare the number of drive objects, motor, encoder, power unit in the of fline project and at the drive). - change the drive state (is a drive ro tating or is there a message/signal?). - carefully note any other message s/signals and remove their cause.
Source: SINUMERIK 840D sl / 840Di sl / SINAMICS S120 Diagnostics Manual (DAsl, 03/2009)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINUMERIK 840D CNC Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 201043 on the SINUMERIK 840D CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Siemens's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4014 Siemens SINUMERIK 840D CNC codes.
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