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Code 6035: Instead of %1 KB the system has only %2 KB of free user memory of type '%3'

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical Instead of %1 KB the system has only %2 KB of free user memory of type '%3' 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 = Free memory capacity in KB defined for the control model %2 = Actual maximum capacity of free memory in KB %3 = Type of memory, "D" =non-battery-backed, "S" =battery-backed Definitions: The alarm can only occur after a 'cold start' (=NCK start-up with standard machine data). The alarm is only a notice. There is no interference with any NCK functions. It shows that the NCK has less free user memory available t han specified by Siemens for this contro l variant. The value of the actually available free user memory can also be taken from the MD18050 $MN_INFO_FREE_MEM_DYNAMIC, MD18060 $MN_INFO_FREE_MEMS_STATIC. Siemens supplies NCK with default settings that, depending on the model, have certain (free) memory space available for the spec ific settings of the actual applications. The original factory setting of NCK systems is thus that the alarm does not occur with a cold start. Reaction: Alarm display. Remedy: Reasons for the message: - The NCK contains compile cycle software, that us es so much memory space that the hardware cannot provide the required memory. - The NCK runs on hardware that is not intended for this NCK release (i.e. that has not enough memory capacity). - If the application runs properly with the remaining free user memory (i.e. can be started up without any errors), the message can simply be ignored. - If the actual application cannot be configured because there is not enough memory capacity available, either the existing compile cycle must be reduced or, if possible, the system must be upgraded with additional memory space. Program Continuation: Clear alarm with the RESET key. Restart part program

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 6035 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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