Option Description Setup
Polling The meter polls an external
device for pressure data.
a. Set Pressure Source to Poll for External Value.
b. Set Polling Slot to an available slot.
c. Set Polling Control to Poll as Primary or Poll as Secondary.
Option Description
Poll as Primary No other HART masters will be on the
network. The Field Communicator is
not a HART master.
Poll as Secondary Other HART masters will be on the
network. The Field Communicator is
not a HART master.
d. Set External Device Tag to the HART tag of the
temperature device.
mA input
An external device sends
pressure data to the meter via
the mA input.
a. Set Channel D to operate as an mA input.
b. Set mA Input Assignment to External Pressure.
c. Set Pressure Source to mA Input.
Digital
communications
A host writes pressure data to
the meter at appropriate
intervals.
a. Set Pressure Source to Fixed Value or Digital
Communications.
b. Perform the necessary host programming and
communications setup to write pressure data to the meter
at appropriate intervals.
Postrequisites
If you are using external temperature data, verify the external temperature value displayed in the Inputs
group on the ProLink III main window.
The current pressure value is displayed in the External Pressure field. Verify that the value is correct.
Need help?
If the value is not correct:
• Ensure that the external device and the meter are using the same measurement unit.
• For polling:
— Verify the wiring between the meter and the external device.
— Verify the HART tag of the external device.
• For the mA Input:
— Verify the wiring between the meter and the external device.
— Verify the power configuration for Channel D. If external power is required, ensure that the loop is
powered.
— Verify the Lower Range Value and Upper Range Value settings for the mA Input.
Configure process measurement applications Configuration and Use Manual
March 2019 MMI-20025166
62 Micro Motion Model 5700 Transmitters with Configurable Outputs
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