Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-120 minutes

Alarm 75050

Siemens 75050 - MCSC: wrong MD configuration, error code

Alarm 75050 indicates a machine data configuration error in the CC_Master axis coupling setup within channel %1. The alarm is triggered when the $MA_CC_MASTER_AXIS parameter references an invalid axis type or violates cross-channel coupling rules defined in SINUMERIK 840D.

Siemens SINUMERIKServo/AxisIntermediate30-120 minutes

75050

Siemens 75050 - MCSC: wrong MD configuration, error code

MCSC: wrong MD configuration, error code

Incorrect configuration in MD $MA_CC_MASTER_AXIS Error code = 2: This axis indicated in the alarm message or the CC_Master axis is a spindle. Error code = 4: Coupling between rotary and linear axes impermissible. Error code = 8: Coupled axes must not be exchanged between channels Control reaction: Interpreter stop Alarm display.

Root Cause Summary

Alarm 75050 indicates a machine data configuration error in the CC_Master axis coupling setup within channel %1. The alarm is triggered when the $MA_CC_MASTER_AXIS parameter references an invalid axis type or violates cross-channel coupling rules defined in SINUMERIK 840D.

Safety

  • Only qualified personnel should diagnose and clear control alarms; follow the machine builder's safety procedures and lockout/tagout where hardware work is required.

Causes and Fixes

  1. 1

    Navigate to SINUMERIK HMI > Diagnosis > Machine Data > Channel %1 > Axes. Locate $MA_CC_MASTER_AXIS and note the axis name referenced.

  2. 2

    Check the referenced axis machine data: verify $MA_AXIS_TYPE and $MA_IS_SPINDLE parameters. If $MA_IS_SPINDLE=1, this axis is configured as a spindle and cannot be a CC_Master.

    Spindle axes have different control loops and cannot participate in synchronous coupling.

  3. 3

    Reconfigure $MA_CC_MASTER_AXIS to reference a valid standard axis (linear or non-spindle rotary) with $MA_IS_SPINDLE=0.

  4. 4

    Download the updated machine data via NCK > Download, then perform a complete PLC restart and power cycle to initialize the new coupling configuration.

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