Code 4013: Invalid NCU link config uration by machin e data %1 = %2 , on NCU_1 = %3
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Invalid NCU link config uration by machin e data %1 = %2 , on NCU_1 = %3 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 = String: MD identifier %2 = Index: MD array %3 = MD value of master NCU Definitions: The link module configuration detected on the local NCU is different from the master NCU of the NCU cluster. The link module configuration defines t he system clock time, the communication baudrate and the maximum number of message transfer retries. The following machine data are used for this purpose: - SYSCLOCK_SAMPL_TIME_RATIO, - IPO_SYSCLOCK_TIME_RATIO, - LINK_RETRY_CTR, - LINK_BAUDRATE_SWITCH, - SYSCLOCK_CYCLE_TIME The values of these machine data must be the same on all NCUs. Reaction: NC not ready. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Remedy: The machine data required for the link module configur ation must be the same on all NCUs in the cluster. Program Continuation: Switch control OFF - ON.
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 4013 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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