Code 22033: [Channel %1: ] Block %2 Axis/spindle %3 'Correct synchronism' diagnostics %4
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 Axis/spindle %3 'Correct synchronism' diagnostics %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 = Channel number %2 = Block number, label %3 = Axis/spindle number %4 = Diagnostics Definitions: The following situation occurred during 'Correct synchronism': - Diagnosis 1: An exis ting override motion is terminated on key reset. - Diagnosis 2: The ove rride motion has been deleted. - Diagnosis 3: Writing of override value not allowed. Synchronism override is deleted. - Diagnosis 4: Override motion is stopped tem porarily (e.g. G74 reference point approach) - Diagnosis 5: Delay of override motion: a cceleration capacity used up by other motions. - Diagnosis 6: Delay of override motion: velocity used up by other motions. - Diagnosis 7: Delay of override motion: the maximum speed is limited to 0. System variable $AC_SMAXVELO_INFO[n] shows the reason for this. - Diagnosis 8: Delay of override motion: the ma ximum acceleration capac ity is limited to 0. $AC_SMAXACC_INFO[n] shows the reason for this. MD11411 $MN_ENABLE_ALARM_MASK activates this alarm: - Bit 9 = 1 for diagnosis 1 to 6 - Bit 12 = 1 for diagnosis 7 to 8 Reaction: Alarm display. Remedy: Deactivate the alarm with MD 11411 $MN_ENABLE_ALARM_MASK Bit9 = 0 or Bit12 = 0. Program Continuation: Clear alarm with the Delete key or NC START.
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 22033 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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