Emerson Micro Motion SGM Series Configuration And Use Manual page 65

3.
4.
Option Description
Polling The meter polls an external de-
vice for pressure data.
Digital communica- A host writes pressure data to
tions the meter at appropriate inter-
vals.
Postrequisites
The current pressure value is displayed in the External Pressure field. Verify that the value is
correct.
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Note
Do not use the offset in conjunction with the fixed pressure value. Enter the adjusted value.
Configuration and Use Manual
The meter requires absolute pressure. If you select Gauge, the device will convert the
input pressure value to the equivalent absolute pressure.
Set Pressure Unit to the unit used by the external pressure device.
Choose the method used to supply pressure data and perform the required setup.
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 digital communications:
- Verify that the host has access to the required data.
- Verify that the host is writing to the correct register in memory, using the correct data
type.
If necessary, apply an offset.
Configure process measurement using ProLink III
Setup
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 net-
work. The Field Communicator is not a
HART master.
d. Set External Device Tag to the HART tag of the temperature
device.
a. Set Pressure Source to Fixed Value or Digital Communications.
b. Perform the necessary host programming and communica-
tions setup to write pressure data to the meter at appropri-
ate intervals.
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