Code 27039: Axis %1 parameterization MD %2[%3] changed, confirmation and functional test required.
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Axis %1 parameterization MD %2[%3] changed, confirmation and functional test required. 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 number %2 = MD identifier %3 = Machine data index Definitions: The parameterization read out by the drive for the SI monitoring functions does not match the NCK parameterization in the displayed MD. The relevant NCK MD has been adjusted. The following relation exists between the NCK MDs and the drive parameters: - $MA_SAFE_BRAKETEST_TORQUE_NORM corresponds to p2003 Reaction: Mode group not ready. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Diagnostics Manual (DAsl), 03/2009 Remedy: Continue with start up, correct checksum. - If MD $MA_SAFE_BRAKETEST_TORQUE_NORM is displayed: The change to p2003 must be taken into account in the parameterization of MD $MA_SAFE_BRAKETEST_TORQUE. The holding torque to be parameterized for the brake test must be reset. $MA_SAFE_BRAKETEST_TORQUE = desired test torque of the brake / p2003 * 100. Then an acceptance test of the functioning of the brake test must be made. Program Continuation: Switch control OFF - ON.
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 27039 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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