Code 4075: Machine data %1 (and maybe others) not changed due to missing permission level %2
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Machine data %1 (and maybe others) not changed due to missing permission level %2 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 = String: MD identifier %2 = Write protection level of the MD Definitions: On executing a TOA file or when writing mach ine data from the part program, an attempt has been made to write an item of data with a higher protecti on level than the access au thorization currently set in the control. The item of data in question ha s not been written and program execution is continued. This alarm is set only when access vi olation is detected for the first time. Reaction: Alarm display. Remedy: Please inform the authorized personnel/service depar tment. Set the required access level by means of keyswitch or password entry or delete the mach ine data concerned from the MD file/part program. Program Continuation: Clear alarm with the Delete key or NC START.
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 4075 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.
Have a better solution?
Help the industrial community by sharing your repair experience for code 4075.
Need a searchable reference for more Siemens SINUMERIK 840D CNC manuals?
We structure equipment manuals into searchable code, title, cause, solution, safety note, and source-reference data. Send a PDF and example searched codes when you need public pages, private search, or structured exports.
Space reserved for Google AdSense / Industrial Affiliate Links
Monetization target for 2026