STEP 5 Operations S5-115F Manual
3.1.8 Block Call Operations
Block call operations specify the sequence of a structured program. Table 3-8 provides an overview
of the block call operations. Examples follow the table.
Table 3-8. Overview of Block Call Operations
Operation Meaning
Jump unconditionally
Program scanning continues in a different block regardless of the
RLO.
The RLO is not affected.
Parameter
0 to 255
*
0 to 255
0 to 255
0 to 255
Operand
JU
JC Jump conditionally
Program scanning jumps to a different block when the RLO is ”1”.
Otherwise program scanning continues in the previous block.
The RLO is set to ”1”.
ID
OB
PB
FB
SB
C
BE Block end
The current block is terminated regardless of the RLO.
Program scanning continues in the block in which the call
originated. The RLO is ”carried along” but not affected.
BEU Block end, unconditional
The current block is terminated regardless of the RLO.
Program scanning continues in the block in which the call
originated. The RLO is ”carried along” but not affected.
BEC Block end, conditional
When the RLO is ”1”, the current block is terminated.
Program scanning continues in the block in which the call
originated. During the block change, the RLO remains ”1”.
If the RLO is ”0”, the operation is not executed. The RLO is set to
”1” and linear program scanning continues.
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Call a data block.
A data block is activated regardless of the RLO.
Program scanning is not interrupted.
The RLO is not affected.
Parameter
1 to 255
**
ID
DB
G Generate and delete a data block.
An area is set up in the RAM to store data regardless of the RLO.
Method of representation: only STL possible
* Please note that certain OBs are assigned by the operating system.
** Data blocks DB 0 to DB 3 are reserved and may only be read (G DB operation illegal):
DB 0 Block address list DB 2 Error DB, subunit A ( 5.4.2)
DB 1 Configuration DB ( 1.1.7) DB 3 Error DB, subunit B ( 5.4.2)
3-32
EWA 4NEB 811 6149-02
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