Manual S5-115F STEP 5 Operations
Block end ”BE”
The ”BE” operation terminates a block. Data blocks do not need to be terminated. ”BE” is always
the last statement in a block.
In structured programming, program scanning jumps back to the block where the call for the
current block was made.
Binary logic operations cannot be continued in a higher-order block.
Example: Program block PB 3 is terminated by the ”BE” statement.
STL
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BE
The ”BE” statement terminates
program block PB 3 and causes
program scanning to return to
organization block OB 1.
ExplanationProgram Sequence
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BE
OB 1 PB 3
JU PB 3
Unconditional block end ”BEU”
The ”BEU” operation causes a return within a block. However, jump operations can by-pass the
”BEU” operation in function blocks ( 3.2.9).
Binary logic operations cannot be continued in a higher-order block.
Example: Scanning of function block FB 21 is terminated regardless of the RLO.
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JC=
BEU
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BE
The ”BEU” statement causes program
scanning to leave function block
FB 21 and return to program block
PB 8.
STL ExplanationProgram sequence
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PB 8 FB 21
JC=
BEU
BE
JU FB 21
EWA 4NEB 811 6149-02
3-37
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