Code 4019: Axis container %1 advance not allowed with current status of NCU %2
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Axis container %1 advance not allowed with current status of NCU %2 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 = NCU number %2 = Axis container number Definitions: This error only occurs with dire ct advancing of the container. With direct container advancing, only one channel is allowed to activate the NC language co mmand for advancing the container. In order to ensure this, the other channels must have the reset status and the axes must be stationary. With NCU link, the above condition appli es to all channels of the NCU group. Error parameters: - 1: NC Ready missing - 16: At least one other channel is active - 35: AXCT axis is active following axis/spindle - 36: AXCT axis is active leading axis - 39: Axis/spindle disable active - 40: Overlaid motion active for AXCT axis - 41: Axis exchange active for AXCT axis - 42: Interpolator active for one axis container axis - 46: Rotating spindle with different Ipo cycle of NCUs - 47: New-Config active Reaction: Interpreter stop NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Remedy: The program must be canceled with Reset and the ze ro offset deselected before activating the axis container switch. Program Continuation: Clear alarm with the RESET key. Restart part 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 4019 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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