Block Search - Siemens SINUMERIK 828D Function Manual

K1: Mode group, channel, program operation, reset response

9.7 Block search

9.7 Block search
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 to 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.
Note
For more information on block searches, refer to:
References:
/FB1/ Function Manual Basic Functions; Auxiliary Function Output to PLC (H2),
Chapter: "Behavior on block search"
504
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions