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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 75500 - HSLC: Configuration error ID=
Alarm 75500 fires when the HSLC (High Speed Linear Contour) rapid cycle-independent switching function with 2D path relation is activated but lacks proper geometry axis configuration or has conflicting Software cam settings. This technology function requires explicit geometry axis assignment in the NC kernel configuration to operate correctly.
75500
Siemens 75500 - HSLC: Configuration error ID=
HSLC: Configuration error ID=
The function CC_FASTON or CC_FASTON_CONT cannot be executed because the following MD configuration is incorrect: ID=2: The NCK system function "Timer-controlled cam signal output" (see Description of Functions "Software cams, Position switching signals (N3)") is configured with machine data MD 10480 $MN_SW_CAM_TIMER_FASTOUT_MASK > 0 at the same time as the function HSLC. As there is only one hardware timer on the NCU, only one of the two functions can be used. ID=4: Programming CC_FASTON and CC_FASTON_CONT requires internal block memory: In order to activate the compile cycle CCHSLC, the entries have to be increased in the following machine data: MD 28090 $MC_MM_NUM_CC_BLOCK_ELEMENTS by 1 element MD 28100 $MC_MM_NUM_CC_BLOCK_USER_MEM by 2 [KB] Control reaction: Alarm display.
Root Cause Summary
Alarm 75500 fires when the HSLC (High Speed Linear Contour) rapid cycle-independent switching function with 2D path relation is activated but lacks proper geometry axis configuration or has conflicting Software cam settings. This technology function requires explicit geometry axis assignment in the NC kernel configuration to operate correctly.
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
Navigate to Siemens HMI Diagnostics > Parameters > Machine Data (MD) > Channel Parameters section.
- 2
Verify MD 20050 'GeometryAxes' contains at least one valid axis assignment (typically X, Y, or Z). Check that the geometry axis count in MD 20051 'GeometryAxesCount' matches the number of configured axes.
Ensure geometry axes are physically available in your channel configuration (MD 20070 - AxisUsed).
- 3
If geometry axes are missing, add the appropriate axis letters to MD 20050 (e.g., 'XYZ' for 3-axis configuration) and set MD 20051 accordingly.
- 4
Reset the NCK module and perform a warm restart (cycle power OFF/ON or use HMI > System > Reset). Verify alarm clears after parameter activation.
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