Rockwell Automation 1794-APB/B FLEX I/O PROFIBUS Adapter Module User Manual - Manual (Page 111)

Glossary
Publication 1794ĆUM057B-EN-P - November 2001
This Glossary contains terms specific to Allen-Bradley and
PROFIBUS FMS and DP.
AllenĆBradley communication defaults
values used for communication configuration data such as
OD, CRL ( for FMS) DP slave database,and bus parameters
whenever the coprocessor’s working RAM configuration is
reinitialized.
application layer
the seventh layer of the seven-layer OSI reference model.
This layer is where the coprocessor first interacts with the
application program.
baud rate
the speed of communication between devices on the
network. All devices must communicate at the same rate.
broadcast relationships
allow transmission of messages to all nodes simultaneously,
but only unconfirmed services are available.
bus parameters
communication parameters used by Link Layer. Main Bus
Parameters are station address, maximum address and baud
rate. These can be changed using the Local Station Manager
or your compatible programming tool.
client
the FMS device that makes use of resources to perform some
type of application function.
CLOSE command
in FMS, terminates the connection with a remote node on the
network.
communication object model
describes the externally visible behavior associated with an
FMS service or group of services. Three types of
communication object models are domain objects, program
invocation objects and variable objects.
CREF
communication reference. In FMS, an index assigned to each
entry connection defined in the CRL.
CSTAT
a qualifier that allows to save the status of a connection.
communication parameters
parameters within the PROFIBUS communication layers
that control the communication process. They are used to
configure and indicate current status of communication and
consist of the OD, CRL, bus parameters for FMS, and slave
database and bus parameters for DP.