Scan Group configuration

Scan Group

ScanGroupList

A unique name for a scan group (device group) in the OPC communications driver from which you want to receive data.

Use the Add (plus sign) button to add a group to the list. Type the group name. To delete a group, select the topic in the list and click the Delete (cross sign) button.

Read-Only

Update Interval

ScanGroup.UpdateRateCmd

The rate, in milliseconds, at which the object will receive updated data values for the scan group.

Supervisory, User

Scan Mode

ScanMode

The scanning mode for the scan group, either ActiveOnDemand, Active, or ActiveAll. For the ActiveOnDemand mode, attributes that are not actively being referenced by any client or object are not scanned. For the Active mode, an attribute is always in the active scanning state. When the last reference to the attribute is unregistered (unadvised) , the attribute is deleted. For ActiveAll, an attribute is always in the active scanning state, but when the last reference to the attribute is unregistered (unadvised), the attribute is not deleted.

Supervisory, User

Hierarchy Path

HierarchyPath

The full hierarchical path to the object that represents the PLC, for example, "Port.ENB_CLX.Backplane." HierarchyPath allows the OPCClient object to replace a legacy DINetwork object such ABCIP, without the need to reconfigure IO references.

Attribute

ScanGroup.ItemList

A user-defined name for an item reference. This name is also known as the alias. The maximum number of attributes that can be preconfigured is 5000.

None

Item Reference

ScanGroup._AliasReference

The item address in the OPC communications driver.

None

import button

<scan group name>.ItemList

Click to import item data from a .csv file for the selected scan group. A dialog box will appear in which you can specify the file to import. The imported .csv data will be inserted as the associated attributes for the selected scan group. Each attribute and its item reference will be added to the list, as long as there is not already a configured reference with the same attribute name. For duplicate references, you will be prompted to replace the existing reference with the new reference, or ignore the new reference. The import button is unavailable if no scan group is selected or if the associated attributes section is locked from the parent object.

None

export button

<scan group name>.ItemList

Click to export item data to a .csv file. A dialog box will appear in which you can specify the name and location of the file to be exported. The resulting .csv file will contain one row for each attribute item. Each row includes two columns: Attribute Name and Item Reference. You can edit the file using Microsoft Excel or a text editor. The export button is unavailable if no scan group is selected or if there is no existing associated attribute.

None