Code 4100: System cycle time/scan time divider corrected for digital drive
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical System cycle time/scan time divider corrected for digital drive 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
Definitions: MD10050 $MN_SYSCLOCK_CYCLE_TIME (system clock cycle) and/or MD10080 $MN_SYSCLOCK_SAMPL_TIME_RATIO (division factor of the position control cycle for actual value acquisition) have been corrected. The new value of the system clock cycle can be taken from MD10050 $MN_SYSCLOCK_CYCLE_TIME. For PROFIdrive: The sampling cycle to which the digi tal drive is synchronized (drive cl ock cycle) is largely determined by the cycle specifications of the STEP 7 pr oject (above all the PROFIBUS and PROFINET cycle grids). An additional, independent cycle division factor is not required for the actual value acquisition (that means MD10080 $MN_SYSCLOCK_SAMPL_T IME_RATIO = 1 usually applies). Reaction: Alarm display. Remedy: No remedial measures are required. The alarm display can be canceled with Reset. 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 4100 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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