S5-95F STEP 5 Operations
8.3 System Operations
System operations and supplementary operations have the following limitations:
• You can program them only in function blocks.
• You can program them only in the STL method of representation.
Since system operations access system data, only users with very profound system knowledge
should use them.
8.3.1 Set Operations
Like the supplementary bit operations, these set operations can change individual bits. Table 8-26
provides an overview of the set operations.
Table 8-26. Overview of Set Operations
Operation MeaningOperand
SU Set bit unconditionally
A specific bit is set to "1" in the system data area.
RU Reset bit unconditionally
A specific bit is set to "0" in the system data area.
Parameter
0.0 to 255.15
ID
RS
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Processing Set Operations
Execution of set operations does not depend on the RLO.
EWA 4NEB 812 6210-02
8-63
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