Emerson AMS Trex User Manual page 19

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User Guide
Device Communicator Plus communication module
Power a FOUNDATION fieldbus device. You need to connect the FOUNDATION fieldbus Power Plug
to the FF pwr and the positive FF terminals.
Connect to a FOUNDATION fieldbus device that is externally-powered or powered by the Trex unit.
Measure current on a 4-20 mA current loop.
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.
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.
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.
AMS Trex Device Communicator overview
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