04.97 Program Execution / Subroutines
3.4 Block search forwards
With the "Block search forwards" function, you can start program execution at any point. This
is necessary, for example, if after an abortion of the program execution, you do not want to
start it from the beginning again.
The program will be aborted if during execution
• there is a WF "traversing" error message
(no error that has to be acknowledged with RESET)
• the operating mode is changed
Stopping the program execution by removing the control signal [ST] is not
a program abortion, i.e. by setting [ST], program execution is continued.
The "block search forwards" function distinguishes between "manual block search" and
"automatic block search". Block search forwards is activated by the commands "read in
manual block search" and "read in automatic block search".
The commands are described in the description of functions in chapter
"Command identification" (AK05).
3.4.1 Automatic block search
Upon a program abortion, the WF 723 C automatically saves the data of the interruption point.
After activation of automatic block search, program execution continues at the last point of
interruption, i.e. with the traversing block at which the program was interrupted.
An automatic block search can only be carried out after a program interruption has occurred.
After a RESET of the axis/axes [RST], no automatic block search is
possible.
©
Siemens AG 1997 All Rights Reserved 6ZB5 440-0VU02
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WF 723 C (Programming Guide)
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