Use With The Hart Tri-Loop - Emerson Rosemount Reference Manual

Reference Manual
00809-0100-4021, Rev GC
A HART-based communicator can test, configure, and format a multidropped 3144P
transmitter the same as in a standard point-to-point installation.
Note
The 3144P is set to address 0 at the factory, allowing it to operate in the standard point-to-point
manner with a 4–20 mA output signal. To activate multidrop communication, the transmitter
address must be changed to a number between 1 and 15, which deactivates the 4–20 mA
analog output, sending it to a fixed 4 mA output. The failure mode current is also disabled. It
also disables the failure mode alarm signal, which is controlled by the upscale/downscale
switch/jumper position. Failure signals in multidropped transmitters are communicated
through HART messages.
3.13

Use with the HART Tri-Loop

To prepare the 3144P transmitter with dual-sensor option for use with a Rosemount 333 HART
Tri-Loop, the transmitter must be configured to Burst Mode and the process variable output
order must be set. In Burst Mode, the transmitter provides digital information for the four
process variables to the HART Tri-Loop. The HART Tri-Loop divides the signal into separate 4–20
mA loops for up to three of the following choices:




When using the 3144P transmitter with dual-sensor option in conjunction with the HART
Tri-Loop, consider the configuration of the differential, average, first good temperatures, Sensor
Drift Alert, and the Hot Backup feature (if applicable).
Note
The procedures are to be used when the sensors and transmitters are connected, powered, and
functioning properly. Also, a field communicator must be connected and communicating to the
transmitter control loop. For communicator usage instructions, see
page
Set the transmitter to Burst Mode
HART 5 Fast Keys
HART 7 Fast Keys
Set process variable output order
HART 5 Fast Keys
HART 7 Fast Keys
Note
Take careful note of the process variable output order. The HART Tri-Loop must be configured to
read the variables in the same order.
HART® commissioning
primary variable (PV)
secondary variable (SV)
tertiary variable (TV)
quaternary variable (QV)
10.
2, 2, 8, 4
2, 2, 8, 4
2, 2, 8, 5
2, 2, 8, 5
Section 3: HART commissioning
"Commissioning" on
April 2014
99