Interoperability; Operation With Other Hosts; St_Rev - Emerson 375 User Manual

Fieldbus Functionality
Interoperability The 375 Field Communicator is designed to
375 operation
with other
hosts

ST_REV

operate with a wide range of F
devices independent of device manufacturer.
Interoperability is achieved through the use of
Device Description Language (DDL) technology
supported by the Fieldbus Foundation.
Basic testing is performed on all DDs. In addition,
each device manufacturer is asked to certify that
they have thoroughly tested their device(s) with the
375 Field Communicator. If certification is not
received, a warning message will display when you
attempt to access an untested device.
When a 375 Field Communicator is connected to a
live fieldbus segment and a host system, it joins
the fieldbus segment but not as the LAS. This
means that, although the 375 Field Communicator
can view and edit device parameters, the control of
the segment is still handled by the node that is
designated the LAS for the segment. You can also
read and write if there is another LAS. Prior to
connecting to a host system review the 375 Field
Communicator Host Testing Summary on
www.fieldcommunicator.com.
ST_REV is a block parameter that increments
each time a block configuration has changed.
While a list of parameters is displayed, the 375
Field communicator will continuously read the
ST_REV of that particular block. If it sees the
ST_REV counter has incremented, it knows that
there has been a change to the block, and it will
automatically refresh (reread) all of the block
parameters. Thus, there would only be a very short
period of time before a change made by another
host would appear on the 375 display.
fieldbus
OUNDATION
4-3