Emerson AMS Trex Device Communicator - Simulate Transmitter on Externally-Powered Loop

Figure 4-18: Example connection for measuring current
A. Analog output.
2. In the Loop Diagnostics application, view the measured current at the top of the
screen.
4.11.3 Simulate a transmitter on an externally-powered loop
for a loop check
The Loop Diagnostics application can control current to simulate a 2-wire transmitter on
an externally-powered loop. In this setup, the digital control system is powering the
current loop and the Trex unit is controlling the current that is input into the digital control
system.
Procedure
1. Connect the lead set to the HART terminals on the Trex unit and to the powered
4-20 mA current loop.
Figure 4-19: Connection for controlling current
A. Analog input.
User Guide Loop Diagnostics application
September 2021
User Guide 149
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