Code 75000: [Channel %1: ] CLC: incorrect MD configuration, error code: %2
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] CLC: incorrect MD configuration, error code: %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
Definitions: On ramp-up the following error was found in the clearance control machine data: Error code = -1:The intermediate points of one of the two sensor characteristics are not rising or falling strictly monotonously. Error code = -2:One of the two sensor characte ristics has less than 2 valid intermediate points. Error code = -3:One of the two sensor characterist ics has more than 5 intermediate points with negative velocity or more than 5 inte rmediate points with positive velocity. Error code = -4:The digital input for sens or collision monitoring as set in MD $MC_CLC_SENSOR_TOUCHED_INPUT has not been activated on the control ( 10350 $MN_FASTIO_DIG_NUM_INPUTS ) Error code = -5:No rapid input was assigned to the spec ial function "Fast retraction in the position controller" via MD $MC_CLC_SENSOR_TOUCHED_INPUT. Error code = -6:The axis selected for the clearance control in MD $MC_CLC_AXNO is not active in the channel. Error code = -7:The 5-axis transformation ( 24100 $MC_TRAFO_TYPE_x ) selected for the clearance control in MD $MC_CLC_AXNO is not configured in the channel. Error code = -8:More than one of the axes involved in the clearance control is the master axis of a gantry grouping 37100 $MA_GANTRY_AXIS_TYPE Error code = -9:One of the axes involved in the clear ance control is the slave axis of a gantry grouping 37100 $MA_GANTRY_AXIS_TYPE Error code = -10: Export versions will only enable acti vation of an axial clearance control, if less than four simulataneously interpol ating axes have been configured. Error code = -11: In MD $MC_CLC_PROG_ORI_AX_M ASK, no or three axes exactly may be configured for CLC(3). When three axes are configured, these must be assigned to the channel with $MC_AXCONF_MACHAX_USED. Reaction: Mode group not ready. Channel not ready. NC Start disable in this channel. Alarm display. Remedy: Modify relevant machine data 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 75000 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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