Code 10656: [Channel %1: ] Axis %2 gantry slave axis dynamically overloaded
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Axis %2 gantry slave axis dynamically overloaded 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 = Axis Definitions: The indicated gantry slave axis is dynamically overloaded, i.e. the slav e axis cannot follow the master axis dynamically Reaction: Mode group not ready. Local alarm reaction. Channel not ready. Interface signals are set. Alarm display. Remedy: Please inform the authorized personnel/service depar tment. Compare the axial machine data of the gantry slave axis with the data of the gantry master axis Program Continuation: Clear alarm with the RESET key in all channel s of this mode group. Restart part 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 10656 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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