Code 27257: PROFIsafe: %1 %2 re ports system error %3 (%4)
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical PROFIsafe: %1 %2 re ports system error %3 (%4) 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 = Type of communication %2 = PROFIsafe address %3 = Error code %4 = Component Definitions: A system error has been detected in the PROFIsafe communication. Depending on the error, the relevant PROFIsafe driver or the entire PROFIsafe communication will be stopped. In %1 the communication type is displayed %1 = F module %1 = SPL %2 = PROFIsafe address of the affected F module (with %1 = F module) %2 = - (with %1 = SPL) In %3 the detected error cause is displayed: %3 = SF: Asynchronous error state (StateFault) %3 = SP: No update of the SPL input/output data (SPL I/O communication) In %4 the affected component is displayed: %4 = NCK %4 = PLC Reaction: Mode group not ready. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. STOP D/E (settable via MD $MN_SPL_STOP_MODE) triggered on all axes wi th safety functionality. Stop of the affected PROFIsafe drivers. Stopped PROFIsafe drivers of F modules of type F-DI or FDIO output failsafe values (0) as F user data to the SPL. Remedy: Power OFF/ON of the control. If the error occurs again, inform the service department. Diagnostics Manual (DAsl), 03/2009 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 27257 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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