Code 14769: [Channel %1: ] Block %2 Spindle %3 Implicit auxiliary function %4 Buffer full
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 Spindle %3 Implicit auxiliary function %4 Buffer full 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 %3 = Spindle number %4 = Auxiliary function number Definitions: A maximum of 5 auxiliary functions of type "M" may be entered in an NC block. The upper limit is the total of programmed and implicitely generated M auxilia ry functions. Implicit auxiliary functions M19 and M70 are generated, if in MD35035 $MA_SPIND_FUNCTION_MASK, bit 19 has been set for M19 and/or bit 20 for M70. M19 is generated with SPOS and SPOSA depending on the configuration. The same applies to M70 and transition into axis oper ation. The address extension corresponds to the spindle number like it is output to the PLC. Reaction: Correction block is reorganized. Interface signals are set. Alarm display. Remedy: - Distribute the M auxiliary func tions and spindle functions that implicitely generate M19 and M70 to several blocks. - Deactivate any implicit auxiliary f unctions that are not required in MD35035 $MA_SPIND_FUNCTION_MASK, bit 19 and/or bit 20. Program Continuation: Clear alarm with NC ST ART or RESET key and continue the program. Diagnostics Manual (DAsl), 03/2009
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 14769 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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