Rockwell Automation 1757-FFLDC4 FOUNDATION Fieldbus System User Manual User Manual
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Rockwell Automation Publication 1757-UM012A-EN-P - July 2011
Glossary
contained parameter
An internal parameter that can not be linked to other function blocks or devices.
ControlNet network An open control network that uses the producer/consumer model to combine
the functionality of an I/O network and peer-to-peer network, while providing
high-speed performance for both functions.
cycle Scanning of inputs, execution of algorithms and transmission of output values
to devices.
deterministic
Ability to measure the maximum worst-case delay in delivery of a message
between any two nodes in a network. Any network protocol that depends on
random delays to resolve mastership is nondeterministic.
device description (DD)
Abbreviated as DD, this is a set of files (CFF, SYM, and FFO) that describes the
parameter capabilities of a fieldbus device. The file information on these block
parameters includes names, data types, and specifications.
device ID
An identifier for a device that the manufacturer assigns. Device IDs must be
unique to the device; no two devices can have the same device ID.
device tag
A character string name that uniquely identifies a device on a fieldbus network.
DHCP
Abbreviation for Dynamic Host Configuration Protocol.
Ethernet
Physical and data link layer defined by IEEE 802 standards used by
FOUNDATION fieldbus.
EtherNet/IP
An open, industrial networking standard that supports both real-time I/O
messaging and message exchange.
FB VFD Acronym for
Function Block Virtual Field Device.
FISCO
Acronym for Fieldbus Intrinsic Safe COncept. Allows more power to an IS
segment for approved FISCO devices, providing for more devices per
IS segment.
FMS
Abbreviation for fieldbus messaging specification, which contains definitions
of application layer services in FOUNDATION fieldbus. The FMS specifies
services and message formats for accessing function block parameters, as well
as object dictionary descriptions for those parameters defined in the
virtual field device.
FNICO
Acronym for Fieldbus Non-Incendive COncept. Allows more power to a
fieldbus segment in a Zone 2 area, thus enabling more devices per segment
than is possible with a
solution.