6.3.1 Setting variable reporting
The Rosemount Transmitter has two choices for variable reporting: Classic -
Discrete State Only or Enhanced – Discrete State and Count.
Procedure
1. In AMS Device Manager, select Configure → Manual Setup → HART.
2. Set Variable Reporting as desired.
Option Description
Classic - Discrete
State Only
The Rosemount Transmitter will report
variables exactly like the previous version of
the device (measurement option code 22).
Enhanced –
Discrete State with
Count
The Rosemount Transmitter will provide both
current state of the discrete channels, and a
count of the discrete state change cycles.
Table 6-4 shows the variable mapping for both cases.
Table 6-4: Variable Mapping
Variable
reporting
PV SV TV QV
Classic –
Discrete
State Only
CH1 State CH2 State Electronics
temperature
Supply
voltage
Enhanced –
Discrete
State with
Count
CH1 State CH2 State CH1 Count CH2 Count
6.3.2 Latching feature
The Rosemount 702 has a latching feature that, when enabled, allows
detection of momentary state changes to be held for a configurable latch
period. The latching feature can be configured to detect either rising or
falling state changes, dependent on the input signal. The latch period (hold
time) can be configured anywhere between 0 seconds and 10 minutes in 1
second increments.
Note
Latching mode is only applicable to input signals.
Setting the Hold Time to anything less than the wireless update rate will
result in unexpected results.
Quick Start Guide April 2021
24 Emerson.com/Rosemount
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