User Manual

Calendars and schedulers
Schedule
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Key
① An exception profile applies to more than one day. On the second day, the exception profile is inactive, because another
profile with a higher priority is active for the whole day.
② An exception program without the entry NULL. This exception profile is active for the whole day and ends automatically in the
automation station at 24:00 hours by the NULL entry.
③ Several exceptions with the same priority on the same day, but without overlapping times. The exception profiles do not
interfere with each other as an exception begins with the first time entry and ends with NULL.
④ Several exception profiles with the same priority on the same day with overlapping times. These exception profiles affect each
other, as several exceptions with the same priority level are active simultaneously. In such cases, the rule is that if the switch
commands are the same, the first time-entry applies (in this example 13:00 to NULL). With non-identical switch commands,
the latest time-entry applies.
⑤ Operation in accordance with the weekly schedule.
Output signals
[PrVal] [NxVal] [NxTi]
The scheduler sends the following output signals:
● [PrVal]
● [NxVal]
● [NxTi]
The [NxVal] und [NxTi] output signals support the optimum start/stop control of the plant. When
determining [NxVal] and [NxTi] in the time schedule, the current day and the next two days are taken into
account. This results in a time window of 48 to 72 hours, depending on the current time and the next switch
entry. If there is no change in [PrVal] within the time window, then [NxVal] is the same as [PrVal] and
[NxTi] is equivalent to the current date plus 3 days (00:00h).
[DefVal]
This default value [DefVal] appears at the [PrVal] output when there is no active entry in the time
schedule, or when the entries are all NIL, or when the time period is outside the active period.
[EnDef]
The [EnDef] variable enables or disables the [DefVal] variable.
The function block variables [DefVal] and [EnDef] are mapped to the Schedule_Default property. The
property Schedule_Default can have the value [DefVal] or NIL.