Siemens SINUMERIK 840D sl Function Manual page 342

Manual and Handwheel Travel (H1)
Approaching a fixed point in JOG
4.11.3 Parameter setting
Movement in the opposite direction
The response while traversing in the opposite direction, i.e. against the direction of the
approaching fixed point depends on the setting of Bit 2 in the machine data:
MD10735 $MN_JOG_MODE_MASK (settings for the JOG mode)
Bit
2
Fixed point positions
A maximum of 4 fixed point positions can be defined for each axis via the following machine
data:
MD30600 $MA_FIX_POINT_POS[n]
Number of valid fixed point positions
The number of valid fixed point positions of an axis is defined via the machine data:
MD30610 $MA_NUM_FIX_POINT_POS
Note
"Approaching fixed point with G75/G751" constitutes an exception in this case. Two fixed
point positions can also be approached here in the setting MD30610 = 0.
4.11.4 Programming
System variables
The following system variables that can be read in the part program and in the synchronous
actions for the "Approach fixed point" function.
System variable
$AA_FIX_POINT_SELECTED [<Axis>]
$AA_FIX_POINT_ACT [<Axis>]
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Value Description
0 Travel in the opposite direction is not possible (default setting).
1 Movement in the opposite direction is possible.
Description
Number of fixed point to be approached
Number of the fixed point on which the axis is
currently located
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions