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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 75051 - MCSC: CC_COPON CC_COPOFF error code
Alarm 75051 fires when CC_COPON or CC_COPOFF coupling commands contain invalid arguments, reference undefined axis couplings, or exceed the permissible number of coupling parameters in the NCK interpreter. This servo-level alarm indicates a mismatch between the programmed coupling syntax and the machine's configured coupling definitions.
75051
Siemens 75051 - MCSC: CC_COPON CC_COPOFF error code
MCSC: CC_COPON CC_COPOFF error code
Error code = 1: Wrong argument programmed Error code = 10: An axis for which no coupling has been defined, was programmed in CC_COPON (axis identifier). Error code = 20: Too many arguments programmed. Error code = 100: Internal error Error code = 200: Internal error Control reaction: Interpreter stop Alarm display.
Root Cause Summary
Alarm 75051 fires when CC_COPON or CC_COPOFF coupling commands contain invalid arguments, reference undefined axis couplings, or exceed the permissible number of coupling parameters in the NCK interpreter. This servo-level alarm indicates a mismatch between the programmed coupling syntax and the machine's configured coupling definitions.
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
Verify the NC program CC_COPON call syntax. Example: CC_COPON(AXIS1,AXIS2) must reference axes with pre-configured coupling in machine data.
- 2
Access HMI > Diagnosis > Machine Data > Axis/Spindle. Confirm MD35100 (axis coupling enable) is set to 1 for all axes used in CC_COPON commands.
- 3
Cross-reference the axis identifiers in the NC program against configured axis names in the NCK Axis configuration. Use the Siemens SINUMERIK documentation to verify coupling parameter assignments (MD35101-MD35110 range for coupling-specific settings).
Ensure axis nomenclature matches exactly; case sensitivity and naming conventions must align with machine data definitions.
- 4
If coupling for the referenced axis does not exist, either add the coupling configuration via machine data or modify the NC program to reference only coupled axes.
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