QuickOPC-UA Timeout Settings

Overview

Parameter	Default value	Description
in UAClientSessionParameters
CloseTimeout	10 000	A timeout for closing the session (in milliseconds).
EndpointSelectionTimeout	30 000	A timeout for endpoint selection (in milliseconds).
OperationTimeout	120 000	Timeout used when sending requests (in milliseconds).
SessionConnectTimeout	60 000	A session connect timeout (in milliseconds).
SessionTimeout	60 000	A session timeout (in milliseconds).
SessionTimeoutDebug	600 000	A session timeout used when a debugger is attached (in milliseconds).
in UADiscoveryParameters
DiscoveryTimeout	15 000	A maximum time a server discovery can take (in milliseconds).
in SDK configuration
(none)

Documentation on how to modify the parameters that are set in the SDK configuration: User's Guide: OPC UA Application Configuration

Note that there are also several timing-related parameters that are not truly timeouts, for example:

• UAClientSessionParameters.KeepAliveInterval
• UAClientSessionParameters.KeepAliveIntervalDebug
• UAClientSessionParameters.RetrialDelay

SessionParameters.CloseTimeout

A timeout for closing the session (in milliseconds).

This parameter is not interpreted by the component; it is simply passed down to the OPC UA Stack for processing.

If the session cannot be closed in a timely manner, it is consider closed anyway, and the component will not use the same session again. The timeout prevents the component from waiting too long or indefinitely for the confirmation. This means that any new requests to the same endpoint will open a new session, as with the properly closed sessions.

SessionParameters.EndpointSelectionTimeout

A timeout for endpoint selection (in milliseconds).

SessionParameters.OperationTimeout

Timeout used when sending requests (in milliseconds).

This parameter is not interpreted by the component; it is simply passed down to the OPC UA Stack for processing.

SessionParameters.SessionConnectTimeout

A session connect timeout (in milliseconds).

SessionParameters.SessionTimeout

A session timeout (in milliseconds).

This parameter is not interpreted by the component; it is simply passed down to the OPC UA Stack for processing.

CreateSession Service Parameters, RequestedSessionTimeout: "Duration. Requested maximum number of milliseconds that a Session should remain open without activity. If the Client fails to issue a Service request within this interval, then the Server shall automatically terminate the Client Session."

SessionParameters.SessionTimeoutDebug

A session timeout used when a debugger is attached (in milliseconds).

DiscoveryParameters.DiscoveryTimeout

A maximum time a server discovery can take (in milliseconds).