A name used by the DataHub instance to identify the connection. There should be no spaces in the name. It doesn't matter what name is chosen, but it should be unique to other connection names.

The name or IP address of the computer running the OPC A&E server you want to connect to. Select it from the drop-down list, or type it in.

The name of the OPC A&E server that you are connecting to, selected from the list of available servers.

The name of the DataHub domain in which the data points are received.

The number of milliseconds to delay the initial connection.

The number of milliseconds to wait before retrying a failed connection.

This option will protect items on the DataHub instance from being changed by the client.

This allows connections to OPC A&E clients which are not configured for acknowledgements or that don't support this part of the OPC A&E specification.

In OPC A&E the time stamp of an event should always be newer than the time stamp of the previous event for any condition. If, perhaps due to differing clock times on connected DataHub machines, you get errors indicating that events have arrived with out-of-order time stamps, then you can select this option to eliminate the warnings and accept the events.

When the DataHub instance connects to an A&E server it queries the server for the current state of all alarm conditions. Some servers report all conditions, whether they are active or not. Other servers only report the state of active conditions. Other servers do not report their initial state at all, and simply let the client learn about condition states as they change.

Selecting this option tells the DataHub instance to wait for an event before identifying conditions (and sources). That means that it won't call GetQualifiedSourceName, and therefore will always present the source as seen in szSource. It also means that an A&E client will not be able to browse the complete condition tree from the DataHub instance, as it will start with no condition information and will only discover it as events arrive.

When constructing a source name from the initial condition state, the DataHub instance builds the source name by appending the source's area path followed by the unqualified source name from the server. This option disables this behaviour and uses only the unqualified name as the source name.

If you are using an A&E server that provides only a partial list of conditions when reading the initial condition state then this allows you to adjust for the behaviour of the server when discovering new conditions as events occur. Specifically, some servers provide an unqualified source name when requesting the initial condition state, but a qualified source name in subsequent events. This option allows you to produce source names that are consistent regardless of whether the source was determined during initialization or discovered later.

This option gives you a way to maintain and access the values of A&E status variables in DataHub data points.

There are three options available:

Severity, or priority, indicates the urgency of a condition for an alarm. A low value, such as 1, corresponds to a low urgency event, for example an informational message. A high value, such as 1000 represents an extreme emergency condition.

This filter lets you select alarms or events according to the type of event, or event category.

This filter lets you select alarms or events based on the area, which is typically a location in a plant, or a specific machine.

This filter lets you select alarms or events based on the specific OPC A&E tag for the point.

Allows for the receipt of incomplete acknowledgements.

This option may allow a client to reload events after they have been modified, and/or add new events.

Causes the DataHub instance to re-transmit current condition information to all A&E clients whenever any client connects. This should only be used when a client requires current condition information but does not request current condition information during its initialization. Normally this should not be necessary.

Tells the DataHub instance to use the source name without qualifying it with the area path. You should not normally need this option. By default the DataHub instance constructs fully qualified source names by prepending the area path to the source name. In most cases this is useful, as it guarantees uniqueness among condition sources, which is required for correct operation. For cases where the unqualified source name is unique in the server, this option provides a way to avoid adding the area path to the source name.

When you connect to multiple A&E servers, the fully qualified source and condition names must be unique across all connected servers. If two servers produce identical source names or identical condition names then the DataHub instance cannot differentiate them. It will not modify the source and condition names to make them unique. The A&E servers must be configured to produce source and condition names that are unique.