AdsConnection.ReadValueAsync(ISymbol, CancellationToken) Method

Read value as an asynchronous operation.

Namespace: TwinCAT.Ads
Assembly: TwinCAT.Ads (in TwinCAT.Ads.dll) Version: 7.0.0+e56d35ccc4675faac24789a4aab60071fc61d470

Syntax

C#

public Task<ResultAnyValue> ReadValueAsync(
	ISymbol symbol,
	CancellationToken cancel
)

Parameters

symbol ISymbol	The symbol that should be read.
cancel CancellationToken	The cancel token.

Return Value

Task<ResultAnyValue>
A Task<ResultAnyValue> representing the asynchronous operation.

Implements

IAdsSymbolicAccess.ReadValueAsync(ISymbol, CancellationToken)

Exceptions

Exception	Condition
ArgumentNullException	symbol
ObjectDisposedException
ClientNotConnectedException

Remarks

This method automatically marshals the read values to appropriate .NET objects if possible. The overall behaviour is described here in the interface description.

Reference

AdsConnection Class ReadValueAsync Overload TwinCAT.Ads Namespace ReadValue(ISymbol) ReadValue(ISymbol) TryReadValue(ISymbol, Object)

Beckhoff Automation GmbH & Co. KG 2001-2026