ValueSymbolExtensionsPollValues(IValueSymbol, IObservableUnit, Boolean) Method
Polls symbol values on trigger signals.
Namespace: TwinCAT.Ads.Reactive
Assembly: TwinCAT.Ads.Reactive (in
TwinCAT.Ads.Reactive.dll) Version:
7.0.0+e56d35ccc4675faac24789a4aab60071fc61d470
Syntax
C#
public static IObservable<Object?> PollValues(
this IValueSymbol symbol,
IObservable<Unit> trigger,
bool ignoreErrors
)Parameters
|
symbol IValueSymbol |
The symbol. |
|
trigger IObservableUnit |
The Polling trigger |
|
ignoreErrors Boolean |
if set to true ADS errors are ignored and a NULL value is returned. |
Return Value
IObservable
Object
IObservable<System.Object>.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IValueSymbol. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
Remarks
If ignoreErrors is not set and ReadRequest errors occur, the observable will be closed with error./> If errors are ignored, the observable will return NULL values on erroneous requests.
Reference
ValueSymbolExtensions Class PollValues Overload TwinCAT.Ads.Reactive Namespace PollValues2(IValueSymbol, IObservableUnit) PollValues(IValueSymbol, IObservableUnit) PollValues(IValueSymbol, TimeSpan, Boolean)
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