Code 4036: Wrong NCU link configuration by MD %1
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Wrong NCU link configuration by MD %1 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 Definitions: Occurs only with an NCU link system. Different interpolation and position control cycles have been set in the NCUs of the LINK group. This is only allowed if the function FAST-IPO-LINK in MD18780 $MN_MM_NCU_LINK_MASK has been activated. Caution: For diagnostic purposes, two additional alarm parameters are output together with this alarm. - 1. 2nd parameter: Position control or IPO cycle time of this NCU - 2. 2nd parameter: Position control or IPO cycle time of another NCU. Diagnostics Manual (DAsl), 03/2009 Reaction: NC not ready. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Remedy: - Activate FAST-IPO-LINK function inMD18780 $MN_MM_NCU_LINK_MASK - Or do not set different position control or IPO cycles on the NCUs (see MD10070 $MN_IPO_SYSCLOCK_TIME_RATIO and MD10060 $MN_POSCTRL_SYSCLOCK_TIME_RATIO). 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 4036 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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