User manual

MVI56-HART ♦ ControlLogix Platform Reference
HART Multi-drop Master Communication Module User Manual
ProSoft Technology, Inc. Page 91 of 171
October 13, 2011
For response messages from HART devices, it is possible to configure where the
Floating Point Data and Integer Data will be placed in the module’s internal database, but
this is only possible for the Universal and Common Practice commands. In the case of
Device Specific commands, all the Read Data is placed in the Integer data section. See
HART Command Support for a listing of supported HART commands.
Burst Mode
If a slave on a network will be placed in burst mode, its data can be placed in the
module's database. For the command to be burst by slave device, enter a command in
the user command list with the appropriate HART command number. Set the type field to
0 to disable the command. The parameters in the command will be used to store the data
received from the bursting slave. There can only be one slave bursting on the network at
any one time. This mode can be used for faster update of data from a slave.
Auto-Polling
This feature is enabled by setting the AUTO-POLL CODE (in the configuration file) to a
value of P (point-to-point). If the value N is entered for the parameter, the auto-poll
feature is disabled. When the feature is disabled, the channel will only execute the
commands enabled in the user command list. When the auto-polling mode is enabled,
the module will automatically acquire data from the HART instruments attached to a
channel without the use of user commands. If user commands are present and enabled
when the feature is enabled, they will also be executed independent of auto-polling.
With the auto-poll feature enabled, the module automatically generates the following
HART commands and stores the data in the module's database at the user-specified
location:
CMD Description
0 Read Unique Identifier
3 Read Current and Four Dynamic Variables
13 Read Tag, Descriptor and Date
14 Read PV Sensor Information
15 Read Output Information
If the unit is set for point-to-point mode, the module will automatically gather the
information for the device with the polling address (short address) of zero and place the
data into the database. Each device requires a 50-word database area with the format
shown in the following table.