Override scenario 1 — Siemens S7 controllers with an OPCClient object

The following scenario illustrates using I/O auto assignment with a Siemens S7 PLC. The Siemens S7 PLC in this example scenario includes a TCP/IP port that is in addition to the OPCClient object and scan group names captured by I/O auto assignment in the IO Devices view.

To configure the Siemens S7 PLC with the OPCClient object

1. Select the OPCClient object or scan group that contains the PLC in the IO Devices view.

   

   I/O attributes for each object associated with the OPCClient or scan group (depending on which is selected in the IO Devices view) are shown in the Mapping view.

2. In the Mapping view, the resulting reference will be in the form: OPCClientName.ScanGroupName.ObjectName.AttributeName

   Example (Resulting Reference column):

   OPCClient_01.SG1.UDO_01.Attribute_001

3. Do not edit the Device.ScanGroup Override column (leave it blank). This leaves the OPCClient Object and scan group assignment as defined in the IO Devices view.

4. Enter the fully qualified field reference in the Object.Attribute Override column. For example:

   S7C_1.S7C_200_1.UDO_01.Attribute001

   

5. Apply the override. The resulting reference will be displayed. For example:

   OPCClient_01.SG1.S7C_1.S7C_200_1.UDO_01.Attribute001