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66 ProLink
®
II Software for Micro Motion
®
Transmitters
Transmitter Configuration, Characterization, and Calibration
5.8 Configuring polling
Polling is used to retrieve temperature or pressure data from an external device. These data can then
be used for API calculation or other process variable calculations in applications that require pressure
or temperature compensation. You may query one or two external devices.
You must also ensure that the primary mA output has been wired for HART protocol. See Chapter 2
or the installation manual for your transmitter.
To configure polling:
1. From the
View menu, select Preferences.
a. To use the external pressure data, ensure that the
Enable External Pressure
Compensation
check box is checked.
b. To use the external temperature data, ensure that the
Use External Temperature check
box is checked.
c. Click
Apply.
2. Ensure that the
External Temperature box in the Temperature tab has not been set. The
default value is 32.00 °F (0.0000 °C).
3. Click the
Polled Variables tab in the Configuration panel.
4. For Polled Variable 1:
a. Click the arrow in the
Polling Control box, and select a HART polling method from the
list. Choose
Poll DP HART Primary if the external device might be accessed by another
device acting as a secondary master (e.g., a HART Communicator). Choose
Poll DP
HART Secondary
if the external device might be accessed by another device acting as a
primary master.
b. Click
Apply. Polling parameters are now displayed for configuration.
c. In the
External Tag box, type the HART tag of the external device that you will poll.
d. Click the arrow in the
Variable Type box, and select a process variable.
e. Click
Apply.
f. The value displayed in the
Current Value textbox is the value received from the external
device. Verify the value.
5. Repeat these steps for Polled Variable 2, if required.
Note: For some transmitters, the Polling Control selection for Polled Variable 1 is automatically used
for Polled Variable 2. No configuration is required.