Emerson AMS Trex Device Communicator User Manual page 129

User Guide
User Guide
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Figure 4-2: Loop Diagnostics when powering a positioner and taking measurements
A. The voltage measured at the HART or HART + pwr terminals
B. Enable/disable the Trex unit to provide power to a transmitter or power and source
current to a positioner. This lets you isolate a problematic device from its HART loop and
verify its operation. Use the HART + pwr terminals on the Trex unit.
C. Enable/disable the Trex unit to control current to an externally-powered positioner or to
an analog input card on a digital control system. The Trex unit controls current the same
way as a transmitter. Use the HART terminals on the Trex unit when the Trex Unit Power
option is off. This option is automatically enabled if Trex Unit Power is on and the Trex
unit is powering a positioner.
D. Change the settings for supplying/controlling current, including the values of the quick
buttons, the scale for the up and down arrows, and the time to change to a new current
value. This option is enabled only when Trex Unit Power or Trex Unit Current is on.
E. The quick buttons to control the current to the positioner or 4-20 mA current loop. You
can change the values of the buttons from the More Options button.
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Loop Diagnostics application
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September 2021
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