Code 201037: <location>ACX: Re-naming the parameter back-up file unsuccessful
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>ACX: Re-naming the parameter back-up file unsuccessful 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: A_INFEED: NONE (OFF2) SERVO: NONE (OFF1, OFF2, OFF3) VECTOR: NONE (OFF1, OFF2, OFF3) Acknowledge: IMMEDIATELY Cause: Re-naming after saving a parameter back-up file on the CompactFlash card or in the volatile memory was unsuccessful. One of the parameter back-up files to be re-nam ed had the "read only" attribute. The parameter backup files are saved on the CompactFlash card in the directory \USER\SINAMICS\DATA. It is possible that the CompactFlash card is defective. Fault value (r0949, interpret hexadecimal): Byte 1: yyy in the file names PSxxxyyy.* or CAxxxyyy.* or CCxxxyyy.* yyy = 000 --> consistency back-up file yyy = 099 --> PROFIBUS parameter back-up file PSxxx099.* Byte 2: xxx in t he file name PSxxxyyy.* xxx = 000 --> data save started with p0977 = 1 xxx = 010 --> data save started with p0977 = 10 xxx = 011 --> data save started with p0977 = 11 xxx = 012 --> data save started with p0977 = 12 Byte 4, 3: Only for internal Siemens troubleshooting. Remedy: - check whether one of the files to be overwritten has the attribute "read only" and change this file attribute to "writable". Check all of the files (PSx xxyyy.*, CCxxxyyy.*, CAxxxyyy.*) that belong to drive yyy designated in the fault value. - replace the CompactFlash card.
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 201037 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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