Code 27093: Checksum error NCK-SPL, %1, %2, %3
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Checksum error NCK-SPL, %1, %2, %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 = Extension indicating the type of error %2 = Extension indicating the reference variable %3 = Extension indicating the actual variable Definitions: A checksum error has occurred in the NCK SPL. The file /_N_CST_DIR/_N_SAFE_SPF was subsequently modified. The safe programmable logic (SPL) in the NCK may be corrupted. Parameter %1 indicates the type of modification: - %1 = FILE_LENGTH: the file length has changed. - %1 = FILE_CONTENT: the file contents have changed. %2 specifies the reference variable (file length, chec ksum of file contents), %3 specifies the actual variable which is ca lculated cyclically. Reaction: Alarm display. Remedy: Check the file and the time of the last modification to the file. Reload the original file and start the monitoring system again with a Power On. Program Continuation: Switch control OFF - ON.
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 27093 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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