Emerson AMS Trex Quick Start Manual page 7

Figure 3:
A. Power a FOUNDATION fieldbus device. You need to connect the FOUNDATION
fieldbus Power Plug to the FF pwr and the positive FF terminals.
B. Connect to a FOUNDATION fieldbus device that is externally-powered or
powered by the Trex unit.
C. Measure current on a 4-20 mA current loop.
D. Power and connect to a HART device. The HART+pwr terminals can measure
the current output of a connected transmitter or control the current input to
a connected positioner. The terminals also have a loop resistor for device
communication.
E. Connect to an externally-powered HART device. The HART terminals also have
an optional loop resistor for enabling HART communications on 4-20 current
loop and optional current control for moving a positioner.
CAUTION!
• Before you insert or remove a communication module, ensure the Trex
unit is powered off.
• Ensure sufficient grounding. Ensure the personnel, working surfaces, and
packaging are sufficiently grounded when handling electrostatically
sensitive parts.
• Avoid touching the pins on the connectors or components. Discharged
energy can affect the modules.
• When you insert/attach the communication module to the Trex unit, do
not over tighten the screws. Use 0.5Nm maximum torque load.
• Remove the USB cable from the Trex unit before connecting to a device.
Quick Start Guide
Device Communicator Plus communication module
7