Code 27040: Axis %1 waiti ng for motor module.
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Axis %1 waiti ng for motor module. 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
Parameters: %1 = Axis name, spindle number Definitions: Alarm on ramp-up as long as the motor module is not yet ready for SI. Communication to the motor module is not yet active on ramp-up, the safety functions are not yet available. The alarm indication can be set in MD $MN_SAFE_ALARM_SUPPRESS_LEVEL so that only one alarm is displayed for all axes. Reaction: Interface signals are set. Alarm display. Remedy: The alarm will remain present during ramp-up if the drive does not communicate. Otherwise the alarm will only be displayed briefly and then deleted automatically. Possible causes for the contin ual presence of this alarm: - The safe motion monitoring is only activated in $MA_SAFE_FUNCTION_ENABLE, but not in the corresponding parameter of the assigned drive (p9501). - The axis -> drive assignment in MD $MA_SAFE_CRTLOUT_MODULE_NR, MD $MN_SAFE_DRIVE_LOGIC_ADDRESS or p0978 is incorrect. - PROFIBUS connector has fallen out. Check the correctness of parameter p9501 and the assignment of the drive in MD $MA_SAFE_CTRLOUT_MODULE_NR and $M N_SAFE_DRIVE_LOGIC_ADDRESS, p0978. Program Continuation: Alarm display showing cause of alarm disapp ears. No further operator action necessary.
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 27040 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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