Emerson Rosemount 2051G, Справочное руководство

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23
Reference Manual
00809-0300-4410, Rev BA
Configuration
January 2018
Configuration
2.13 Configuring burst mode
Burst mode is compatible with the 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 (pressure and temperature in engineering units, pressure in percent of range, Scaled
Variable, and/or analog output), and does not affect the way other transmitter data is accessed.
However, when activated, bust mode can slow down communication of non-dynamic data to the host by
50 percent.
Access to information other than dynamic transmitter data is obtained through the normal
poll/response method of HART communication. A Field Communicator, AMS Device Manager, or the
control system may request any of the information that is normally available while the transmitter is in
burst mode. Between each message sent by the transmitter, a short pause allows the Field
Communicator, AMS Device Manager, or a control system to initiate a request.
HART 5
Message content options:

PV only

Percent of Range

PV, 2V, 3V, 4V

Process Variables

Device Status
HART 7
Message content options:

PV only

Percent of Range

PV, 2V, 3V, 4V

Process Variables and Status

Process Variables

Device Status
HART 7 trigger mode
When in HART 7 mode, the following trigger modes can be selected.

Continuous (same as HART 5 burst mode)

Rising

Falling

Windowed

On Change
Note
Consult your host system manufacturer for burst mode requirements.