Tip
Devices using HART protocol to communicate with the transmitter may use either HART Address or
HART Tag (Software Tag) to identify the transmitter. Configure either or both, as required by your
other HART devices.
2. Set HART Long Tag to a unique value on your network.
3. Ensure that mA Output Action is configured appropriately.
Option Description
Enabled (Live) The primary mA Output reports process data as configured. This is the
appropriate setting for most applications.
Disabled (Fixed) The primary mA Output is fixed at 4 mA and does not report process data.
Important
If you use ProLink III to set HART Address to 0, the program automatically enables mA Output Action.
If you use ProLink III to set HART Address to any other value, the program automatically disables mA
Output Action. This is designed to make it easier to configure the transmitter for legacy behavior.
Always verify mA Output Action after setting HART Address.
10.5.2 Configure HART variables (PV, SV, TV, QV)
ProLink III
Device Tools → Configuration → Communications → Communications (HART)
Field communicator Configure → Manual Setup → Inputs/Outputs → Variable Mapping
The HART variables are a set of four variables predefined for HART use. The HART variables include the
Primary Variable (PV), Secondary Variable (SV), Tertiary Variable (TV), and Quaternary Variable (QV). You can
assign specific process variables to the HART variables, and then use standard HART methods to read or
broadcast the assigned process data.
Tip
The Tertiary Variable and Quaternary Variable are also called the Third Variable (TV) and Fourth Variable (FV).
Restriction
On some devices, the PV is fixed to a specific process variable and cannot be changed.
Options for HART variables
Process variable
Primary
Variable (PV)
Secondary
Variable (SV)
Third Variable
(TV)
Fourth
Variable (QV )
Standard
Line Density ✓ ✓ ✓ ✓
Sample Temperature ✓ ✓ ✓ ✓
Sample Temperature (External or Fixed) ✓ ✓ ✓ ✓
Line Pressure (External or Fixed) ✓ ✓ ✓ ✓
Configuration and Use Manual Integrate the meter with the control system
MMI-20020954 March 2021
Configuration and Use Manual 95
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