
Reference Manual
00809-0100-4716, Rev JA
May 2008
Rosemount 3095 MultiVariable
3-26
HART
HART Tab
The HART tab is used to set some of the communications parameters that are
used by HART protocol.
•
Tag:
same parameter as found on the “Basic Setup” tab.
•
Poll Address
: users can assign a unique HART address to the 3095 to
differentiate it from other devices if set up on a multidrop network.
•
Number of Response Preambles
: changes the number of response
preambles for the transmitter to EA communication. Typically, this
value is set at five. Increase the value only if the transmitter is installed
in an electrically noisy environment.
•
Burst Mode
: must be enabled for operation with a Rosemount 333
Tri-Loop. With burst mode ON, the 3095 continuously outputs HART
parameters, eliminating the time required for the control system to
request information from the transmitter.
Burst mode is compatible with use of the analog signal. Because HART
protocol features simultaneous digital and analog data transmission, the
analog value can drive other equipment in the loop while the control system or
Tri-Loop receives the digital information.
Access to information other than burst data is obtained through the normal
poll/response method of HART communication. The EA or the control system
may request any of the information that is normally available while the
transmitter is in burst mode. However, the response time to these requests
will be longer. Between each burst message sent by the transmitter, a short
pause allows the EA or control system to initiate a request. The transmitter
receives the request, processes the response message, and then continues
bursting the data approximately three times per second. When sending a new
flow configuration file from the EA, the burst mode must be OFF.
Burst mode is not compatible with Multi Dropping more than one transmitter
because there is no method to discriminate the data communications from
multiple field devices.
•
Burst Option
: From the pull down menu select what type of data will
be sent when the transmitter is in Burst Mode. For use with the 333
Tri-Loop, the Burst Option must be set to “process vars/crnt” (HART
CMD3).
Summary of Contents for Rosemount 3095
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