Overview; Installation And Commissioning; Rosemount 333 Hart Tri-Loop Configuration - Emerson Rosemount 3051S Series Reference Manual

Reference Manual
00809-0100-4801, Rev EA
August 2010
ROSEMOUNT 333
HART TRI-LOOP
CONFIGURATION

Overview

Installation and
Commissioning
Figure 7-19. Tri-Loop Wiring
Diagram
The Rosemount 333 HART Tri-Loop can be used in conjunction with the
Rosemount 3051S with Advanced HART Diagnostics to acquire up to two
more variables via 4-20mA analog signals. The additional two outputs are
selected by the user and can include: Pressure, Temperature, Scaled
Variable, Standard Deviation, or Mean.
Below are the four major steps to commission the 3051S and Tri-Loop.
Further detail on these steps can be found in the Tri-Loop Instruction manual.
1. Check the 3051S Variable assignments and remap as necessary to
assign the two variables intended to be the Tri-Loop output for the
Secondary (Second) and the Tertiary (Third) variables. Take note of the
Secondary and Tertiary variable information including variable, variable
name, and variable units as it will be necessary to duplicate this exactly
in the Tri-Loop for proper operation.
2. Connect the 3051S to the 333 Tri-Loop. The 3051S 4-20mA output
connects to the 333 Burst Input. See Figure 7-19.
HAZARDOUS
AREA
Rosemount 3051S
3. Configure the Tri-Loop. The Channel configuration must be identical to
the variables mapped in the 3051S. Note: The Tri Loop default address
is 1. The HART host must be configured to Poll for the 333 in order to
find the Tri-Loop.
4. Enable Burst mode in the 3051S. The Burst Mode must be ON and the
Burst Option must be set to Process Vars/Crnt.
Rosemount 3051S Series
DIN
Rail Mounted
HART Trip-Loop
Ch. 3
Ch. 2
Ch. 1
Burst Input
to Tri-Loop
RL 250 
HART Burst Command 3/
Analog Output
Intrinsically Safe Barrier
NON HAZARDOUS AREA
Each Tri-Loop
Channel
receives
power from
Control Room
Channel 1 must
be powered for
the Tri-Loop to
operate
Device
receives power
from Control
Room
Control Room
7-23