Statement List (STL) - DCE FEL ČVUT v Praze

Program Control Instructions
10.4 BEU Block End Unconditional
Format
Description
Status word
Example
BEU
BEU (block end unconditional) terminates the program scan in the current block and
causes a jump to the block that called the current block. The program scan resumes
with the first instruction that follows the block call. The current local data area is
released and the previous local data area becomes the current local data area. The
data blocks that were opened when the block was called are re-opened. In addition,
the MCR dependency of the calling block is restored and the RLO is carried over
from the current block to the block that called the current block. BEU is not
dependent on any conditions. However, if the BEU instruction is jumped over, the
current program scan does not end and will continue starting at the jump destination
within the block.
BR CC 1 CC 0 OV OS OR STA RLO /FC
writes: - - - - 0 0 1 - 0
STL Explanation
A I 1.0
JC NEXT //Jump to NEXT jump label if RLO = 1 (I 1.0 = 1).
L IW4 //Continue here if no jump is executed.
T IW10
A I 6.0
A I 6.1
S M 12.0
BEU //Block end unconditional.
NEXT: NOP 0 //Continue here if jump is executed.
Statement List (STL) for S7-300 and S7-400 Programming
10-4 A5E00706960-01