Block Search, Types 1, 2, And 4 - Siemens SINUMERIK 840D sl Function Manual

Program code
ELSE
N5 X300 OMA1=10
ENDIF
9.7

Block search, types 1, 2, and 4:

Function
Block search offers the possibility of starting part program execution from almost any part
program block.
This involves the NC rapidly performing an internal run through the part program (without
traversing motions) to the selected target block during block search. Here, every effort is made
to achieve the exact same control status as would result at the target block during normal part
program execution (e.g. with respect to axis positions, spindle speeds, loaded tools, NC/PLC
interface signals, variable values) in order to be able to resume automatic part program
execution from the target block with minimum manual intervention.
Block search types
● Type 1: Block search without calculation
Block search without calculation is used to find a part program block in the quickest possible
way. No calculation of any type is performed. The control status at the target block remains
unchanged compared to the status before the start of the block search.
● Type 2: Block search with calculation at contour
Block search with calculation at contour is used to enable the programmed contour to be
approached in any situation. On NC Start, the start position of the target block or the end
position of the block before the target block is approached. This is traversed up to the end
position. Processing is true to contour.
● Type 4: Block search with calculation at block end point
Block search with calculation at block end point is used to enable a target position (e.g. tool
change position) to be approached in any situation. The end position of the target block or
the next programmed position is approached using the type of interpolation valid in the
target block. This is not true to contour.
Only the axes programmed in the target block are moved. If necessary, a collision-free
initial situation must be created manually on the machine in "JOG REPOS" mode before
the start of further automatic part program execution.
● Type 5: Block search with calculation in "Program test" (SERUPRO) mode
SERUPRO (search run by programtest) is a cross-channel block search with calculation.
Here, the NC starts the selected part program in "Program test" mode. On reaching the
target block, the program test is automatically deselected. This type of block search also
enables interactions between the channel in which the block search is being performed and
synchronized actions as well as with other NC channels.
See Section "Block search Type 5 (SERUPRO) (Page 493)."
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
K1: Mode group, channel, program operation, reset response
Comment
9.7 Block search, types 1, 2, and 4:
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