7 OPC UA ObjectTypes

7.1 CalendarType

7.1.1 Overview

The CalendarType provides a list of calendar dates. Each entry in the list describes a specific date or date pattern, or range of dates. The CalendarType ObjectType is formally defined in Table 4.

7.1.2 ObjectType definition

This PresentValue indicates the current value of the calendar: True if the current date is in the DateList and False if it is not. For the current date that local time of the OPC UA Server shall be considered.

The DateList is an array of elements of which each is either a specific date or date pattern, or range of dates.

The child Nodes of the CalendarType have additional Attribute values defined in Table 5.

7.1.3 Method AddDateListElements

This Method adds entries to the DateList Property. Even if one entry cannot be added, the other entries are still processed and added, if possible. The signature of this Method is specified below. Table 6 and Table 7 specify the Arguments and AddressSpace representation, respectively.

Signature

	AddDateListElements (
		[in]		CalendarEntryType[]		CalendarEntries
		[out]	0:Int32[]				EntryResults
		);

Method Result Codes (defined in Call Service)

7.1.4 Method RemoveDateListElements

This Method removes entries from the DateList Property. Even if one entry cannot be removed, the other entries are still processed and removed, if possible. The signature of this Method is specified below. Table 8 and Table 9 specify the Arguments and AddressSpace representation, respectively.

Signature

	RemoveDateListElements (
		[in]		CalendarEntryType[]		CalendarEntries
		[out]	0:Int32[]				EntryResults
		);

Method Result Codes (defined in Call Service)

7.2 ScheduleType definition

7.2.1 Overview

The ScheduleType defines a periodic schedule that can recur over a range of dates. The schedule may have optional exceptions at arbitrary times or dates. The basic unit of a schedule is days, which are divided into two types: normal days within a week and exception days. A priority mechanism defines which scheduled event is currently valid. The ScheduleType is formally defined in Table 10.

7.2.2 ObjectType definition

The ExceptionSchedule provides an array of SpecialEventType. If present, each of those special events describes a sequence of schedule actions that take precedence over a normal day’s behaviour on a special day or days.

The WeeklySchedule provides an array of seven DailyScheduleType. Each entry represents one day of the week. The first entry in the array represents Monday, the last Sunday. Each element describes a sequence of times and a list of actions that provides a sequence of schedule actions on one day of the week when no ExceptionSchedule is in effect.

At least one of the two Properties ExceptionSchedule and WeeklySchedule shall be present.

To manipulate the ExceptionSchedule, the Methods AddExceptionScheduleElements and RemoveExceptionScheduleElements should be used. This simplifies adding and removing entries of the array. As the WeeklySchedule is a fixed-size array with a length of 7, there are no corresponding Methods. Instead, an individual entry of the array may be written by the Client to change only the schedule of one weekday.

The 0:LocalTime provides information about the local time of the schedule Object. All scheduled times are UTC time. Clients need to consider this Property to calculate the local time of the schedule. If this Property is changed, it is server-specific whether the times of the schedule are adjusted or not. If the Server and the Object the schedule is defined for are in the same local time, the Object may reference the 0:LocalTime Property of the 0:Server Object.

The EffectivePeriod specifies the range of dates within which the schedule Object is active. Upon entering its effective period, the object shall execute the defined actions at the defined times, otherwise it shall not execute any actions.

The ApplyLastAfterStart Property defines if the last set of actions shall be applied when starting the schedule Object (see 6.3 for details).

The child Nodes of the ScheduleType have additional Attribute values defined in Table 11.

7.2.3 Method AddExceptionScheduleElements

This Method adds entries to the ExceptionSchedule Property. Even if one entry cannot be added, the other entries are still processed and added, if possible. The signature of this Method is specified below. Table 12 and Table 13 specify the Arguments and AddressSpace representation, respectively.

Signature

	AddExceptionScheduleElements (
		[in]		SpecialEventType[]		SpecialEvents
		[out]	0:Int32[]				EntryResults
		);

Method Result Codes (defined in Call Service)

7.2.4 Method RemoveExceptionScheduleElements

This Method removes entries from the ExceptionSchedule Property. Even if one entry cannot be removed, the other entries are still processed and removed, if possible. The signature of this Method is specified below. Table 14 and Table 15 specify the Arguments and AddressSpace representation, respectively.

Signature

	RemoveExceptionScheduleElements (
		[in]		SpecialEventType[]		SpecialEvents
		[out]	0:Int32[]				EntryResults
		);

Method Result Codes (defined in Call Service)