Lenze DDS v2.3 - Manual (Page 187)

Drive PLC Developer Studio
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DDS EN 2.3
Tip!
If a timeout has occurred and the variable SFCError has not been reset, no subsequent timeouts
will be registered.
7.8.6 Sequential function chart in online mode
Monitoring
•
The SFC editor displays the currently active steps in blue in online mode.
•
If several steps are active in a parallel branch, the active step with the action to be processed
next is displayed in red.
•
With IEC steps, all active actions will be displayed in blue in online mode.
•
Select Extras ➞ ➞ ➞ ➞Options and option box Time limit overview to display time limits next to
the steps.
•
A third time is displayed below the minimum and maximum time limits to indicate how long
the step has so far been active:
In the above illustration, the step has already been active for 8 seconds and 410 milliseconds. It must
be active for at least 7 minutes before the step is exited, however.
Tip!
Monitoring of expressions (e.g. A AND B) in transitions will display the overall transition value only.
Breakpoints
Use Online ➞ ➞ ➞ ➞Breakpoint on/off to set a breakpoint to a step. In an action, the breakpoint can be
set to the positions permitted for the applied language.
•
Processing will then stop before this step or position is executed.
•
Steps or positions to which a breakpoint is set are displayed in light blue.
Single step processing
SFC supports single step processing ( Online
➞ ➞ ➞ ➞Single step over). The program always advances
to the next step with an action to be processed.
If the current position is:
•
a step in a linear sequence of an organization unit or a step in the parallel branch at the
extreme right of an organization unit, the process exits the SFC organization unit and returns
to the invoking unit, starting the next cycle if that is the main program.
•
a step in a parallel branch not at the extreme right, the process jumps to the active step in the
next parallel branch.
•
the last breakpoint position within an action, the process jumps to the unit that called the
SFC.
•
the last breakpoint position within an IEC action, the process jumps to the unit that called the
SFC.
•
the last breakpoint position within an entry action or exit action, the process jumps to the first
active step.
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