Emerson 4320, Instruction Manual, Page: 34 / 64

Instruction Manual
D103621X012
4320
January 2018
34
Monitor Only
Message 0: Selected Device Variables - On, Windowed, 4 second triggered update, 1 minute default
Message 1:
Additional Device Status
- On, On­Change, 1 minute triggered update, 1 hour default, Delayed Triggering
Message 2:
Discrete Variables
- On, On­Change, 1 minute triggered update, 10 minute default
Sensor Sample Rate: 1 second for a battery powered device. (50 milliseconds for external power)
Hardware Triggering — enable/disable the device hardware circuit that checks for position sensor input changes while
the firmware is asleep, and issues a wake­up call if a change occurs.
Message 0
Message 1
Message 2
To configure a burst message manually select Message 0 , Message 1, or Message 2 . Open to view the current burst
configuration. Select Configure and follow the prompts on the Field Communicator to configure Message 0 , 1 , or 2 ;
review and choose to accept the changes or to continue to modify the configuration. Once accepted the information
is sent to the device. The device processes the information, providing feedback about any errors that may have
resulted.
Enabling burst mode provides periodic publication of the configured messages to the gateway. The gateway maintains
a cache of this published information. It then acts as a proxy for all wireless devices by fulfilling routine host requests
using the latest data in its cache.
Note
It is recommended that you set burst mode to defaults during initial setup, and make any detailed adjustments to burst
configuration after the device is connected to an operating wireless network.
Burst mode is only supported over the wireless link. No burst transmissions are made over the wired Maintenance Port connection.
To select the basic message content, choose from Primary Variable, PV % Range and Loop Current, Dynamic Variables and
Current, Selected Device Variables, Additional Status, Emerson Specific , and Discrete Variables .
If Dynamic Variables and Current , Selected Device Variables , or Emerson Specific are chosen for basic content, you can
configure individual device variables in the message slots. Select variables from the available drop­down or selection
list that are relevant for your application.
Note
Variables marked with an asterisk (*) are not calculated by the device under the current installed options and/or structure
configuration. They should not be assigned for publication unless your host will not function correctly without them.
If an Emerson Gateway is in use, the 'Emerson-Specific' choice can be used. It combines the four Dynamic Variables and
the Additional Status in one message. However, it does not include the Loop Current or PV % Range variables. If the
control system requires PV % Range and Loop Current, make sure that these two variables are included in a message
configured for 'Selected Device Variables'.