Siemens SINUMERIK 840D sl Function Manual page 566

Brief description
Block search
The block search function enables the following program simulations for locating specific
program points:
• Type 1 without calculation at contour
• Type 2 with calculation at contour
• Type 4 with calculation at block end point
• Type 5 automatic start of the selected program point with calculation of all required data
• Automatic start of an ASUB after a block search
• Cascaded block search
• Cross-channel block search in program test mode
Program operation
The execution of part programs or part program blocks in AUTOMATIC or MDA modes is
referred to as program operation. During execution, the program sequence can be controlled
by PLC interface signals and commands.
Initial settings can be specified in channelspecific machine data for each channel. These
initial settings affect, for example, G groups and auxiliary function output.
A part program can be selected only if the relevant channel is in the Reset state.
Furthermore, all further program runs are handled by PLC interface signals and the
corresponding commands.
• Start of part program or part program block
• Part program calculation and program control
• RESET command, program status, and channel status
• Responses to operator and program actions
• Eventdriven program calls
Asynchronous subroutines (ASUBs), interrupt routines
Interrupt inputs allow the NC to interrupt the the current part program execution so that it can
react to more urgent events in interrupt routines or ASUBs.
8
from history
Basic logic functions: Mode group, channel, program operation, reset response (K1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0