Emerson 3051S Spezifikationen Seite 65

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39
Reference Manual
00809-0100-4803, Rev DA
Section 3: Configuration
April 2013
Configuration
Figure 3-21. Device - comm setup tab
Burst mode
When Burst Mode Enable is set to on, the 3051S MultiVariable Transmitter sends up to four HART
variables to the control system without the control system polling for information from the
transmitter.
When operating with Burst Mode Enable set to on, the transmitter will continue to output a 4-20
mA analog signal. Because the HART protocol features simultaneous digital and analog data
transmission, the analog value can drive other equipment in the loop while the control system is
receiving the digital information. Burst mode applies only to the transmission of dynamic data
(process variables in engineering units, primary variable in percent of range, and/or analog
output), and does not affect the way other transmitter data is accessed.
Access to information that is not burst can be obtained through the normal poll/response
method of HART communication. A 475 Field Communicator, AMS, Engineering Assistant, or
the control system may request any of the information that is normally available while the
transmitter is in burst mode.
Enabling burst mode
To enable burst mode, select On from the Burst Mode Enable drop-down menu under the Burst
Mode heading.
Mass and Energy Flow Fast Keys 1, 4, 3, 3, 3
Direct Process Var. Output Fast Keys 1, 4, 3, 3, 3
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