Emerson Rosemount 702 Quick Start Manual page 25

April 2018
5.3.1 Setting variable reporting
The Rosemount 702 Transmitter has two choices for variable reporting:
Classic - Discrete State Only, or Enhanced – Discrete State and Count.
1. In AMS Device Manager, select Configure > Manual Setup > HART.
2. Set Variable Reporting as desired.
Option
Classic - Discrete State
Only
Enhanced – Discrete
State with Count
Table 5‐4
Table 5-4:
Variable reporting
Classic – Discrete State Only
Enhanced – Discrete State
with Count
5.4 Discrete output circuits, measurement option code 42
The Rosemount 702 Transmitter has two channels that can each be
configured for discrete input or output. Inputs must be dry contact switch
inputs and these were described in a preceding section of this document.
Outputs are a simple switch closure to activate an output circuit. The
Rosemount 702 Transmitter output does not provide any voltage or current,
the output circuit must have power of its own. The Rosemount 702
Transmitter output has maximum switch capacity per channel of 26 volts DC
and 100 milliamps.
Note
It is very important that the polarity of the output circuit is as shown in the
wiring diagrams, with the positive (+) side of the circuit wired to the +
terminal of each channel, and the negative (-) side of the circuit wired to the
CMN terminal. If the output circuit is wired backwards it will remain active
(switch closed) regardless of the state of the output channel.
Quick Start Guide
Description
The Rosemount 702 Transmitter will report variables exactly like
the previous version of the device (measurement option code
22).
The Rosemount 702 Transmitter will provide both current state
of the discrete channels, and a count of the discrete state
change cycles.
shows the variable mapping for both cases.
Variable Mapping
PV
CH1 State CH2 State Electronics tem-
CH1 State CH2 State CH1 Count
SV TV
perature
Quick Start Guide
QV
Supply voltage
CH2 Count
25