Field Bus Discovery Service

Overview

The field bus discovery service is available for BMEAHI0812 and BMEAHO0412 gateway DTMs that are connected to field devices. Only the first level devices below the gateway DTMs are detected – recursive scanning is not supported.

NOTE: A device that is connected on the field bus can be detected if:

Its DTM is installed on the PC.
The DTM hardware catalog is up-to-date with the DTM installed.

Field Bus Discovery Use

The results of the scanning process are compared to the registered DTMs in the DTM catalog of the host PC. If a match is found in the DTM catalog for a scanned device, the results include a Match property that describes the precision of the match.

The Match property displays one the following values:

Exact:

All identification attributes are matching. The correct device type was found.
Generic:

At least the Manufacturer ID and Device Type ID attributes match. The support level of DTM is “Generic Support”.
Uncertain:

At least the Manufacturer ID and Device Type ID attributes match. The support level of DTM is not “Generic Support”.

The following procedure explains how to use the Field Bus Discovery service:

Step	Action
1	In the DTM Browser, select either BMEAHI0812 or a BMEAHO0412 gateway DTM.
2	If the gateway DTM is not connected to its field devices, right-click to open the contextual menu and select Connect.
3	With the gateway DTM selected, right-click to open the contextual menu and select Field bus discovery. The Field bus discovery channel selection dialog opens.
4	In the Field bus discovery channel selection dialog, select a channel for discovery and click OK. The service and performs discovery for the selected channel.
5	If at least one matched device has been found, the Field Bus Discovery dialog opens listing the scanned and matched devices.
6	Use the 3 buttons (Add one, Add all, Remove), described below to select and add matched devices that are added to the DTM Browser.
7	Click OK to insert the selected device DTMs into the DTM Browser. The On Line Modification Authorization message box opens, informing you that you need to rebuild the project offline. Click Yes to continue.
8	If there are one or more devices in the Selected DTMs list with the same address as a device that is already included in the DTM Browser, a message box opens asking if you want to continue. If you click OK, each pre-existing device with an address that is the same as a selected device is deleted and replaced by the DTM selected in the Selected DTMs list.
9	After the project is rebuilt, the discovered and selected field devices appear in the DTM Browser beneath the selected gateway DTM.

Field Bus Discovery Dialog

If at least one matched device has been discovered, the Field bus discovery dialog is displayed listing the scanned and matched devices. Select the matched devices to be added to the DTM Browser. The device you select appear in the Selected DTMs list. This dialog has three lists:

List	Description
Scanned Devices	Displays all the devices (matched and unmatched) found during the scan.
Matched DTMs	Displays the matched DTM found in the workstation DTM catalog for the selected device in the Scanned Devices list. Each time a scanned device is selected in the Scanned Devices list, the contents of the Matched Devices list is updated to display the matched device DTM found for the selected scanned device. The matching process can yield one or more matched devices for a given scanned device. In this case, select one among the matched DTMs found.
Selected DTMs	Displays the device DTMs selected to be added to the DTM Browser.

The lists present a colored icon for each item:

Color	Description
Green	The device has been selected
Yellow	The device has been matched
Red	The device has not been matched
Black	Information about the address of the scanned device: In the Scanned Devices list, the device has an address identical to one of the DTMs in the Control Expert project. In the Matched DTMs list, the device is assigned an address identical to one of the DTMs in the Control Expert project.

The Matched DTMs and Selected DTMs lists present these 3 buttons:

Button	Use this button to...
Add all	Automatically add the most closely matched device DTM for each discovered device in the Matched DTMs list to the Selected DTMs list.
Add one	Add the matched device DTM selected in the Matched DTMs list to the Selected DTMs list.
Remove	Remove one or more devices from the Selected DTMs list.