Device item definitions

The predefined item syntax/name for the S7 PLC cannot be changed. However, to make it easier to remember item names, you can create aliases for these item names.
For example, it may be easier for you to remember the item syntax "mb80" as "Temperature."

Select the Device Items tab in the OI Server Manager user interface to create new, modify, delete, export, or import device-item definitions for an object. The configuration is performed in the Device Items dialog box, which appears when you click the Device Items tab in the New_S7Cp_000 Parameters configuration view.

After you configure item names, the Communication Driver can perform OPC Item browsing. When the Communication Driver is running and an OPC client requests item information, the configured items appear under the PLC hierarchy node. User-defined data types appears at the lowest level in the hierarchy when browsed via the OPC client.

Create or add device items

1. Right-click in the Device Items box and click Add.

2. Type the item name in the Name column.
   For example, "Temperature."

3. When you add a new device item, enter a unique name.

4. Double-click the line in the Item Reference column and enter the correlated item reference for the name you selected.
   For example, "mb80."

   Note: If the name and the item reference are the same, it is only necessary to enter a name. The Communication Driver assumes that the item reference is the same. This is necessary if you want to add some items for browsing via the OPC, even if they do not have a symbolic name.

Rename device items

• Right-click on the device item to be renamed and click Rename. Make the changes.

Delete device items

• Right-click on the device item to be deleted from the list and click Delete.

Clear all device items

• Right-click in the Device Items box and click Clear All. All the device items listed are cleared after you confirm their deletion.