The TimerControlFunctionType defines a simple “one shot” Timer which stops once it has elapsed. It follows the design of other LADS ControlFunctions, utilizing the same state machine and similar variable definitions. The TimerFunctionType is formally defined in Table 117.

Once started, the CurrentValue counts upwards from zero until it reaches the TargetValue.

The DifferenceValue is calculated by subtracting the CurrentValue from the TargetValue. Thus, it counts downwards from the TargetValue to zero.

As soon as the CurrentValue reaches the TargetValue, the CurrentState of the TimerFunction automatically transitions to Off. This is typically accompanied by some (internal) action/effect, such as stopping the execution of a Function or similar.

In the SuspendedState the CurrentValue holds its current value and does not count further until the state switches back to On, either due to a Client command or an internal state change.

Table 117 – TimerControlFunctionType Definition

Attribute	Value
BrowseName	TimerControlFunctionType
IsAbstract	False
References	Node Class	BrowseName	DataType	TypeDefinition	Other
Subtype of the BaseControlFunctionType defined in 7.6.1
0:HasComponent	Variable	CurrentValue	Duration	AnalogUnitRangeType	O
0:HasComponent	Variable	DifferenceValue	Duration	AnalogUnitRangeType	O
0:HasComponent	Variable	TargetValue	Duration	AnalogUnitRangeType	O
Conformance Units
LADS TimerControlFunctionType

CurrentValue is the elapsed time in milliseconds since the Timer was started.

DifferenceValue is the remaining time in milliseconds until the Timer will be stopped.

TargetValue is the target time in milliseconds.