Rockwell Automation 1788-EN2PAR EtherNet/IP and ControlNet to PROFIBUS PA Linking Device User Manual - Manual (Page 68)

68 Rockwell Automation Publication 1788-UM058B-EN-P - September 2014
Glossary
DO Abbreviation for discrete output; signal is generated by the host system and
transmitted to a field device.
DTM Acronym for Device Type Manager; used to connect to the field device and
configure the parameters.
Ethernet Physical and data link layer defined by IEEE 802 standards used by EtherNet/IP.
EtherNet/IP An open, industrial networking standard that supports both real-time I/O
messaging and message exchange.
GSD Acronym for General Status Description; used to define the class 1 capabilities of
the field device.
link A logical link is a connection between function blocks; a physical link is a
connection between fieldbus devices.
linking device As a bridge, enables peer-to-peer communication between PA devices without
the need for host system intervention. As a gateway, connects the PA network to
other plant control and information networks, such as EtherNet/IP and
ControlNet.
network A network as applied in this document is the termination of one or more fieldbus
segments into an interface card of the Host system.
node The connection point at which media access is provided.
node address A node address is a unique address identifier for a device assigned to a Profibus
network. A PROFIBUS network can have as many as 126 devices connected on
it, where each device on the network must have a unique node address between 0
and 126.
offline Perform tasks while the Host system is not communicating with the
field devices.
online Perform tasks, such as configuration, while the Host system is communicating
with the field devices.
Profibus Network A Profibus network uses RS485 to connect devices (for example, controllers,
drives, motor starters and other equipment in automation systems). A Profibus
network can support a maximum of 126 devices. Each device is assigned a unique
node address and transmits data on the network at the same data rate. A cable is
used to connect devices on the network. It contains the bus signal. Devices can be
connected to the network in a daisy chain connection.
PV Acronym for Process Variable, which is the primary value.
redundancy The duplication of devices for the purpose of enhancing the reliability or
continuity of operations in the event of a failure without loss of a
system function.