Code 27092: Communication broken off during NCK PLC data cross check, error detected by %1
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Communication broken off during NCK PLC data cross check, error detected by %1 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 monitoring channel that detected the error Definitions: The delay time (1s) for communication monitoring was exceeded in the monitoring channel specified in %1 (NCK or PLC). The other monitoring channel did not send a new data packet within this time. Reaction: Alarm display. A timer of 5 secs is started, after the expiry of which - the external NCK SPL outputs are deleted - the PLC changes to stop. Remedy: Check the system components (the PLC must have the correct version of FB15 and DB18). 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 27092 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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