OPC HDA Source System: Settings Tab

Force Flat Namespace

The following settings are possible:

• Off

  This is the default setting. With this setting, the hierarchical namespace is displayed.

• On

  If this setting has been made, all hierarchy information is removed from the namespace of the OPC DA server and stored at root level. This means that only a root folder is displayed, in which all tags are stored.

Acceptable Data Quality

With this setting, you define the OPC data quality of a tag that is to be allowed. When a tag is read out of the OPC source system, the data quality of the tag is also provided and can be taken into account accordingly.

The following settings are possible:

• Any Quality

  This is the default setting. This setting means that the data quality of a tag is not taken into account.

• Good

  If you choose the setting Good, only tags with good data quality are used. If the data quality is poorer (for example, Uncertain or Bad), PCo issues an error message.

• Uncertain

  If you choose the Uncertain setting, only tags with the data quality Good or Uncertain are accepted. If the data quality is poor, PCo issues an error message.

• Bad

  If you choose the Bad setting, PCo also accepts tags with poor data quality.

• Error

  The OPC server sets the data quality of a tag to Error if the call has failed. The effect of the Error setting is that tags with this data quality are also accepted by PCo.

Sampling Interval (Sec)

In the notification process, this is the interval at which it is checked whether the value of a subscribed tag has changed.

Batch Processing

By choosing this indicator, you control whether you want the data source to return the selected tags all at once or individually in the query process. Batch processing is the default setting. Only deselect this indicator if your special source system does not support the batch selection of tags.