Statement List (STL) - DCE FEL ČVUT v Praze

10.3 BEC Block End Conditional
Format
Description
Status word
Example
BEC
Program Control Instructions
If RLO = 1, then BEC (block end conditional) interrupts 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 current data blocks when the block
was called are re-opened. The MCR dependency of the calling block is restored.
The RLO (= 1) is carried over from the terminated block to the block that called. If
RLO = 0, then BEC is not executed. The RLO is set to 1 and the program scan
continues with the instruction following BEC.
BR CC 1 CC 0 OV OS OR STA RLO /FC
writes: - - - - x 0 1 1 0
STL Explanation
A I 1.0 //Update RLO.
BEC //End block if RLO = 1.
L IW4 //Continue here if BEC is not executed, RLO = 0.
T MW10
Statement List (STL) for S7-300 and S7-400 Programming
A5E00706960-01 10-3