Siemens SINUMERIK 840D sl Function Manual page 826

Positioning Axes (P2)
Response with special functions
11.8 Response with special functions
11.8.1 Dry run (DRY RUN)
The dry run feedrate is also effective for positioning axes unless the programmed feedrate is
larger than the dry run feedrate.
Activation of the dry run feed entered in SD42100 $SA_DRY_RUN_FEED can be controlled
with SD42101 $SA_DRY_RUN_FEED_MODE. See
References:
/FB1/ Function Manual, Basic Functions; Feedrates (V1)
11.8.2 Single block
Positioning axis type 1
Single-block mode is effective with positioning axes of type 1.
Positioning axis type 2
Positioning axes of type 2 also continue across block limits in single block mode.
Positioning axis type 3
Positioning axes of type 3 also continue across block limits in single block mode.
826
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions