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Options for burst message contents (continued)Table 6-9:
HART
command
Label
DescriptionProLink III Field Communicator
48 Read Additional Transmitter
Status
Read Additional Device Sta-
tus
The transmitter sends expanded device status infor-
mation in each burst message.
4. Depending on your choice, select the four or eight user-specified variables for the
burst message, or set the HART variables as desired.
Important
If you change the HART Primary Variable (PV) or Secondary Variable (SV), the process
variables assigned to the primary mA output and the secondary mA output (if applicable) are
automatically changed to match. The PV cannot be changed on devices with fixed mA output
assignments.
Configure HART trigger mode
Display Not available
ProLink III Device Tools > Configuration > Communications > Communications (HART)
Field Communicator Configure > Manual Setup > HART > Burst Mode > Burst Message x > Configure Update Rate
Overview
Trigger mode uses the burst message mechanism to indicate that a process variable has
changed. When trigger mode is implemented, the bursting interval (HART update rate)
changes if Primary Variable or Burst Variable 0 moves above or below the user-specified
trigger level. You can set up a different trigger on each burst message.
Prerequisites
Before you can configure trigger mode, the corresponding HART burst message must be
enabled.
Procedure
1. Select the burst message for which you will set up trigger mode.
2. Set Trigger Mode to the type of trigger you want to use.
Option Description
Continuous The burst message is sent at Default Update Rate. The burst interval is not affected
by changes in process variables.
Falling • When the specified process variable is above Trigger Level, the burst message
is sent at Default Update Rate.
• When the specified process variable is below Trigger Level, the burst message
is sent at Update Rate.
Integrate the meter with the control system
Configuration and Use Manual 113