Emerson AMS Trex Device Communicator User Manual page 58

Field Communicator application
September 2021
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58
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If the device connection wizard completes its process and cannot connect to the device, a
message is displayed. Tap Cancel to return to the Connect - Select screen to retry the
connection process.
Note
The selections are not saved in the device connection wizard. You need to select the
desired options each time you connect to a device.
Note
If you tap Back during the device connection wizard, the change you made on that screen
is canceled and the previous screen is displayed. For example, if you enabled the Trex unit
to provide power and changed the polling address from 0 to 63 and then tapped the Back
button, the polling address is set to the default value of 0, but the Trex unit still powers the
device. You can also tap Back to return to a previous question and provide a different
answer/selection.
Problems the device connection wizard can detect
The device connection wizard can also identify common wiring problems, including if the
wrong terminals on the Trex unit are used or if a lead set is not connected to the device or
the Trex unit. If a problem is detected, a message describes the problem or a graphic
shows the correct wiring.
The Trex unit continuously monitors the voltage and current at the terminals where the
lead set is connected. the Field Communicator application displays a message if an error is
detected, including if the lead set is removed from the device or Trex unit. For example, if
you try to enable the Trex unit to power a device that already has power, the Field
Communicator application displays a message that voltage was detected and the Trex
power supply is turned off to protect the device and Trex unit.
In some cases, you may be able to override the warning from the device connection
wizard. For example, some devices may hold voltage for several minutes after being
disconnected from the power supply. If you enable the Trex unit to power a device that is
still holding a low voltage (less than 8 volts), a message is displayed that the Field
Communicator application detects low voltage and asks if the Trex unit is connected to a
digital control system's control loop. You can override this warning and apply power if you
are sure the device is not connected to an external power supply.
If the device connection wizard detects a problem, you can fix the issue while the
connection wizard is displayed. The change is updated in the Power Status and
Communication Status sections.
Status when detecting a device
When the Trex unit tries to detect and connect to a device, the Power Status option and
the Communication Status option on the Connect - Select screen show one of the
following status messages.
Power Status Message
Voltage Detected on HART
www.
Description
Typical status for connecting across HART device's
communication terminals when the device is on an externally-
powered loop.
The detected voltage is greater than or equal to 8 volts.
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