Siemens SINUMERIK codes
Siemens SINUMERIKOvertravel/LimitIntermediate30-120 minutes

61275

Siemens 61275 - Block : Target point violates software limit switch!

Block: Target point violates software limit switch!

Due to a swivel action, the end point is outside the software limit switches Control reaction: Interpreter stop NC Start disable in this channel. Interface signals are set. Alarm display.

Root Cause Summary

Alarm 61275 occurs when a swivel/rotary axis transformation (E_SP_RP cycle) repositions the tool tip to a location outside the machine's software limit switches. This is a kinematic violation where the calculated end effector position exceeds the axis boundaries defined in MD32100-MD32199 (axis limit parameters), typically triggered during 5-axis simultaneous swivel operations or tool length offset compensation calculations.

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 Diagnostics > Parameters > Axis Parameters for the affected axis. Verify MD32100 (Axis min limit) and MD32101 (Axis max limit) against machine mechanical limits and workpiece geometry. Check if limits are symmetric or if one direction is excessively constrained.

    Do not modify limits without consulting machine documentation; incorrect limits can cause hardware collision.

  2. 2

    Cross-reference the target point coordinates from the NC program block %2 with the axis travel range. Calculate whether the swivel angle change requires additional axis travel beyond current limit definitions.

  3. 3

    Expand software limit switch range by adjusting MD32100 and MD32101 if machine mechanics permit, or restructure the program to approach the target point with a pre-swivel repositioning to ensure intermediate positions remain within limits.

  4. 4

    Verify MD32110 (Max. axis velocity) and MD32120 (Max. axis acceleration) are properly tuned; insufficient acceleration can cause overshoot prediction errors in the E_SP_RP cycle that trigger false limit violations.

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