Siemens SINUMERIK 840D sl Programming Manual page 288

Job planning

Hide thumbs Also See for SINUMERIK 840D sl:

Table of Contents

Transformations

7.7 Online tool length compensation (TOFFON, TOFFOF)

Block preparation

During block preparation in preprocessing, the current tool length offset active in the main

run is also taken into consideration. To allow extensive use to be made of the maximum

permissible axis velocity, it is necessary to stop block preparation with a STOPRE

preprocessing stop while a tool offset is set up.

The tool offset is always known at the time of run-in when the tool length offsets are not

changed after program start or if more blocks have been processed after changing the tool

length offsets than the IPO buffer can accommodate between run-in and main run.

Variable $AA_TOFF_PREP_DIFF

The dimension for the difference between the currently active compensation in the

interpolator and the compensation that was active at the time of block preparation can be

polled in the variable $AA_TOFF_PREP_DIFF[ ].

Adjusting machine data and setting data

The following machine data is available for online tool length offset:

• MD 20610: ADD_MOVE_ACCEL_RESERVE acceleration margin for overlaid motion

• MD 21190: TOFF_MODE: content of system variable $AA_TOFF[ ] is recovered or

• MD 21194: TOFF_VELO velocity of online tool length offset.

• MD 21196: TOFF_ACCEL acceleration of online tool length offset.

• Setting data for presetting limit values

References: /FB3/ Function Manual, Special Functions; 3- to 5-Axis Transformations (F2).

integrated as an absolute value

SD 42970: TOFF_LIMIT upper limit of tool length offset value.

Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0

Job planning