Siemens SINUMERIK 840D sl Function Manual page 481

Time sequence
Block search
starting
Block search
active (DB21, ...
DBX33.4)
Action block
active (DB21, ...
DBX32.3)
Last action block
active (DB21, ...
DBX32.6)
Channel status
Reset (DB21, ...
DBX35.7)
Channel status
interrupted
(DB21, ... DBX35.6)
Action blocks
During a block search type 2 or type 4 (block search with calculation to ...), actions such as
tool (T, D), spindle (S), feedrate programming or M function outputs are collected. With NC
start to execute the action blocks, the collected actions are output to the PLC.
Note
With NC start for the action blocks, the spindle programming collected during block search
type 2 or type 4 (block search with calculation to ...) (S value, M3 / M4 / M5 / M19, SPOS) becomes
active.
The user has to ensure in the PLC user program that the tool can be operated or the spindle
programming is reset or not output:
DB31, ... DBX2.2 = 1 (spindle reset) .
Supplementary conditions
Continuation mode after block search type 4
If initial programming of an axis is performed incrementally to a block search type 4 (block
search with calculation to block end point), the programmed incremental value can be added
to the position value collected up to the search target or to the current actual value of the axis.
The setting is made via:
SD42444 $SC_TARGET_BLOCK_INCR_PROG
The setting data is evaluated with NC start for outputting the action blocks.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
K1: Mode group, channel, program operation, reset response
Block search
Search target 1
starting
found
9.7 Block search, types 1, 2, and 4:
Search target 2 NC Start
found action blocks
being output
Last
action block
481