Code 14757: [Channel %1: ] Block %2 motion synchronous action and wrong type
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 motion synchronous action and wrong type 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 = Channel number %2 = Block number, label Definitions: Programmed combination between action and type of motion synchronous action is not allowed. - RET allowed in technology cycle only - Function "Several feeds" not allowed in technology cycle - H and M function outputs not allowed with WHENEVER, FROM and DO - MEASA / MEAWA / MEAC with WHENEVER, FROM and DO not allowed - DELDTG and STOPREOF allowed only in bl ockwise synchronous action with WHEN and EVERY Reaction: Correction block is reorganized. Interface signals are set. Alarm display. Remedy: Modify part program. Program Continuation: Clear alarm with NC ST ART or RESET key and continue the 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 14757 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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