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"Individual structures" Option
If you selected the "Individual structures" option, the structures of the steps are
entered in the instance DB as separate sections, as follows:
Internal access uses the step number or the step name followed by the name of
the structure element.
This means that the following access is possible in conditions or actions:
• S003.X
• S017.T
• DRY.X
External access uses only the step name (structure name) followed by the name of
the structure element, as follows:
• DRY.X
• DRY.T
15.12
Sequencer Status
The sequencer status area consists of several components (arrays or structures)
containing information about the status of the sequencer, as follows:
• Permanent Instructions Component
• Index Arrays Component
• Mode Component (Mode of Operation, MOP)
• Activation Time Component
• Group Bits Component
The sequencer status area starts at the address: a = FB parameter length +
transition array length(s)+step array length(s).
S7-GRAPH for S7-300/400 Programming Sequential Control Systems
C79000-G7076-C526-01
Structure Name
<Step1>
...
<Stepn>
Instance DB
Length in Bytes
32
32
15-13
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