Code 201017: <location>Component lists changed
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Component lists changed 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: %1 Drive object: All objects Reaction: NONE Acknowledge: NONE Cause: On the memory card, one file in the directory /SIEMENS/SINAMICS/DATA or /ADDON/SINAMICS/DATA has been ill egally changed with respect to t hat supplied from the factory. No changes are permitted in this directory. Alarm value (r2124, interpret decimal): The problem is indicated in the first digit of the alarm value: 1: File does not exist. 2: Firmware version of the file does not match the software version. 3: The file checksum is incorrect. The second digit of the alarm value indicate s in which directory the file is located: 0: Directory /SIEMENS/SINAMICS/DATA/ 1: Directory /ADDON/SINAMICS/DATA/ The third digit of the alarm value indicates the file: 0: File MOTARM.ACX 1: File MOTSRM.ACX 2: File MOTSLM.ACX 3: File ENCDATA.ACX 4: File FILTDATA.ACX 5: File BRKDATA.ACX Remedy: For the memory card file involved, restore t he status originally supplied from the factory.
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 201017 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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