Code 22018: [Channel %1: ] Block %2 following axis/spindle %3 time monitoring: 'Synchronism fine' not reached
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 following axis/spindle %3 time monitoring: 'Synchronism fine' not reached 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 = Following axis/spindle number Definitions: After reaching the setpoint-side sy nchronism, the time until reaching the actual value-side synchronism is fine monitored. The tolerance is not reached within the time window defined in MD37240 $MA_COUP_SYNC_DELAY_TIME[0]: MD37210 $MA_COUPLE_POS_TOL_FINE and MD37230 $MA_COUPLE_VELO_TOL_FINE Reaction: Alarm display. Remedy: Please inform the authorized personnel/service department. The interrelation between MD37240 $MA_COUP_SYNC_DELAY_TIME[0] and MD37210 $MA_COUPLE_POS_TOL_FINE or MD37230 $MA_COUPLE_VELO_TOL_FINE must be adapted to the mechanical conditions. 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 22018 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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