Siemens SINUMERIK 828D Function Manual page 49

Mode of operation of the offset in the tool direction
The tool length compensations do not change the tool parameters, but are taken into
account within the transformation or the tool carrier that can be orientated, so that offsets are
obtained in the tool coordinate system.
For each dimension, it is possible to define whether the tool length compensation specified in
$AA_TOFF should be calculated as an absolute or incremental (integrating) value via the
following machine data:
MD21190 $MC_TOFF_MODE (operation of tool offset in tool direction)
The current value of the tool length compensation can be read via the system variable
$AA_TOFF_VAL.
Note
An evaluation of the variables $AA_TOFF_VAL is only useful in conjunction with an active
orientation transformation or an active tool carrier.
Examples
Selecting the online tool length compensation
Machine data for online tool length compensation:
● MD21190 $MC_TOFF_MODE = 1
● MD21194 $MC_TOFF_VEL[0] = 10000
● MD21194 $MC_TOFF_VEL[1] = 10000
● MD21194 $MC_TOFF_VEL[2] = 10000
● MD21196 $MC_TOFF_ACC[0] = 1
● MD21196 $MC_TOFF_ACC[1] = 1
● MD21196 $MC_TOFF_ACC[2] = 1
Synchronized actions
Function Manual, 07/2012, 6FC5397-5BP40-3BA0
2.3 System variables for synchronized actions
Detailed description
49