Rockwell Automation PLC-5 Fieldbus Solutions for Integrated Architecture User Manual - Manual (Page 114)

Publication 1757-UM006A-EN-P - May 2002
4-28 Configurating the 1757-FIM
7. Repeat the procedure to assign other devices.
Checking Device Configuration
Use the following procedure to check the configuration of a selected
fieldbus device in the Project tab. This procedure assumes that the
device has been assigned to a Link.
TIP
An alternate method to the following procedure is to
drag and drop the device to the applicable Link in
Project.
TIP
While the device has been assigned to a link, this is
still “offline” configuration of a matching physical
device that is to be connected to this Link.
Each device on the link must have a unique physical
device tag (PD_TAG) that the fieldbus system relates
to a node address. The physical device tag, node
address, and the manufacturer device identifier
(DEV_ID) are used to match a configured device to a
physical device.
In ProcessLogix, each independent component in the
control strategy must have a unique tag name
(NAME). This is automatically enforced through the
Control Builder application. For this reason, the
unique name that was assigned to the device when it
was created in project is also assigned as the device’s
physical device tag. This is done to assure that the
names are unique within the system. This means a
change in NAME results in an automatic change in
PD_TAG to keep them the same. However, a change
in PD_TAG does not result in an automatic change in
the assigned NAME.
So, the name and physical device tag can be
different. Since it is possible to change a physical
device tag configuration using a handheld
communicator, you must be sure the device name
specified on this configuration form matches the
device name configured in the device.