Code 27112: Axis %1 CRC error of the safe actual value.
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Axis %1 CRC error of the safe actual value. 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 = Axis number Definitions: An error has been detected on verifying data cons istency of the safe actual value (CRC). Reaction: Alarm display. In addition, a Stop F is triggered that may caus e follow-up alarm 27001 with error code 0 as well as alarms 27023 and 27024. Alarm 27001 with error code 0 c an be avoided by alarm reduction ($MA_SAFE_ALARM_SUPPRESS_LEVEL higher or equal to 1). Remedy: Possible causes of the conti nual presence of this alarm: - The NCK monitoring channel for safe motion moni toring is not communicating with the monitoring channel of the assigned drive but with that of another axis. Check the correctness of the assignment of the drive in the hardware configuration, $MA_SAFE_CTRLOUT_MODULE_NR, $MN_SAFE_DRIVE_LOGIC_ADDRESS, and p0978. - Interference in the communication between NCK and drive. Check compliance with the EMC guidelines. Exchange hardware. 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 27112 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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