Configure Hart Trigger Mode - Emerson Micro Motion 5700 Configuration And Use Manual

Configuration and Use Manual
MMI-20025166
Important
If you change the HART Primary Variable (PV), the process variable assigned to mA Output 1 is
automatically changed to match.

Configure HART trigger mode

Display Menu > Configuration > Inputs/Outputs > Channel A > HART Settings > Burst Message x > Trigger Mode
ProLink III Device Tools > Configuration > Communications > Communications (HART) > Trigger Mode
Configure > Manual Setup > HART > Burst Mode > Burst Message x > Configure Update Rate
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.
Rising • When the specified process variable is below Trigger Level, the burst message is sent
at Default Update Rate.
• When the specified process variable is above Trigger Level, the burst message is sent
at Update Rate.
Windowed This option is used to communicate that the process variable is changing rapidly.
Trigger Level defines a deadband around the most recently broadcast value.
• If the process variable stays within this deadband, the burst message is sent at
Default Update Rate.
• If the process variable moves outside this deadband in either direction, the burst
message is sent at Update Rate.
If any value in the burst message changes, the burst message is sent at Update Rate.
On Change •
Configuration and Use Manual
Configure digital communications
March 2019
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