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Reference Manual
00809-0100-4021, Rev FB
August 2011
Rosemount 3144P
3-26
HART
Figure 3-8 shows an example of a typical multidrop network. Do not use this
figure as an installation diagram. Emerson Process Management product
support can help with specific requirements for multidrop applications. Note
that multidrop is not suitable for safety-certified applications and installations.
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.
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:
• primary variable (PV)
• secondary variable (SV)
• tertiary variable (TV)
• quaternary variable (QV)
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 Hot Backup features (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 “Commissioning” on page 2-2.
Aotewell Ltd
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