Code 27073: Checksum error S7 PROFIsafe configuration. Confirmation and acceptance test required!
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Checksum error S7 PROFIsafe configuration. Confirmation and acceptance test required! 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: The F parameters required for PROFIsafe communi cation are protected by a checksum. The alarm indicates that the current checksum no longer co rresponds to the stored c hecksum, this means that an MD has either been changed without authorization or is faulty. Reaction: Mode group not ready. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Remedy: Check the PROFIsafe configuration on the S7 si de. Have the checksum recalculated. Re-accept safety functions (PROFIsafe I/Os). 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 27073 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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