Siemens SINUMERIK 840D sl Programming Manual

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System variable Meaning$AC_TOFFL[]with 0 ≤ n ≤ 3Reads the current offset value of TOFFL (for n = 0) or TOFFL[1...3] (forn = 1, 2, 3) in the main run context (synchronized actions).$AC_TOFF[] Reads the current offset value of TOFF[] in the main run con‐text (synchronized actions).$AC_TOFFR Reads the current offset value of TOFFR in the main run context(synchronized actions).$AC_TOFFCR Reads the current offset value of the corner radius in the main run con‐text (synchronized actions).NoteThe system variables $AC_TOFFL, $AC_TOFF, AC_TOFFR and AAC_TOFFCR trigger anautomatic preprocessing stop when reading from the preprocessing context (NC program).ApplicationsThe "Programmable tool offset" function is especially interesting for ball mills and milling toolswith corner radii as these are often calculated in the CAM system to the ball center instead ofthe ball tip. However, the tool tip is generally measured when the tool is measured, and storedas tool length in the compensation memory.For the 3D tool radius compensation with a ball mill it is advantageous to correct the tool lengthand radius by the same value simultaneously. The TOFFLR address is available to the user forthis purpose.Fundamentals2.5 Tool offsetsNC programming88 Programming Manual, 12/2019, 6FC5398-2EP40-0BA0