Configuring Burst Mode (Optional) - Emerson Rosemount 2140 Reference Manual

Configuration
January 2017
2.11

Configuring burst mode (optional)

Burst mode is compatible with the analog output signal. Due to the way that 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 variables (PV, SV, TV, and QV), and
does not affect the way other data is accessed. However, when activated, burst mode can
slow down communication of non-dynamic variable data to the host by 50%.
Access to information other than dynamic variables 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 level detector is in burst mode. Between each message sent by the level detector,
a short pause allows the Field Communicator, AMS Device Manager or a control system to
initiate a request.
Choosing burst mode options in HART 5
Message content options:
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Choosing burst mode options in HART 7
Message content options:
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Choosing a HART 7 Trigger Mode
When in HART 7 mode, the following trigger modes can be selected.
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38
Fast keys
2, 2, 5 or 6, 3
PV only
Percent of Range
PV, SV, TV, and QV
Process Variables
Device Status
PV only
Percent of Range
PV, SV, TV, and QV
Process Variables and Status
Process Variables
Device Status
Continuous (same as HART5 burst mode)
Rising
Falling
Windowed
On Change
Reference Manual
00809-0100-4140, Rev AA
Configuration