Code 75610: [Channel %1: ] RESU: NC start currently not possible
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] RESU: NC start currently not possible 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
Definitions: While RESU is active, no NC START must be perfo rmed in certain situations. If NC START is confirmed nevertheless, execution will be blocked and alarm 75610 will be displayed. This applies in the following situations: - On requesting return traveling: NC START is bl ocked when return traveling program cc_resu.mpf has been created and selected. - After having triggered continuation under NC STOP condition: as long as the internally started block search or the finally started Asup cc_resu_bs_as up.spf is running. Reaction: Interface signals are set. Alarm display. Remedy: Wait for completion of the current internal procedure. Then delete the alarm with NC START and continue 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 75610 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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