OPCClient object configuration Block Read tab

Block Read

BlockReadList

A unique name for a block read group.

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

Read-Only

Transaction Timeout

BlockRead.TransactionTimeout

The amount of time, in milliseconds, allowed for the block read transaction to complete. The default value is 0. There is no transaction timeout when this value is 0.

Read-Only

Access Path

BlockRead.AccessPath

The OPC address path. The path syntax is specific to the type of OPC communications driver.

Read-Only

Attribute

BlockRead.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

BlockRead._AliasReference

The item address in the OPC communications driver.

None

import button

<block read name>.ItemList

Click to import item data from a .csv file for the selected block read name. 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 block read name. 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 block read name is selected or if the associated attributes section is locked from the parent object.

None

export button

<block read 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 block read name is selected or if there is no existing associated attribute.

None