Code 27035: Axis %1 new hardware component, confirmation and functional test required.
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Axis %1 new hardware component, 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 Definitions: The IDs for the corresponding hardware components (encoder, motor module) read out by the drive do not match the NCK parameterization. Reaction: Mode group not ready. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Remedy: The following has to be done if the alarm occurs during the start-up: - Confirm the checksum SAFE_ACT_CHECKSUM[1] (k ey switch position 3 or password has to be entered). Continue the start-up. The following has to be done if the alarm occurs after an encoder module or a DRIVE-CLiQ motor has been replaced: - In the Diagnostics operating area, confir m the hardware checksum with softkey in SAFE_ACT_CHECKSUM[1] (key switch posit ion 3 or password has to be entered) - Readjust the actual value encoder. - Check the SI actual value acquisi tion: velocities, traver sing direction, absolute position (set user acknowledgement if necessary) - Document the new checksum value in SAFE_ACT_CHECKSUM[1] and the last entry in the change history in MD SAFE_CONFIG_CHANGE_DATE[0] - Document the hardware and software version data of the new component. 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 27035 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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