Integrate the meter with the control system
The transmitter can poll an external pressure device for current pressure data. The pressure value is
used only for pressure compensation. If you are not implementing pressure compensation, do not
set up polling for pressure.
Tip
To obtain value from pressure compensation, the external measurement device must be reliable and
accurate.
Prerequisites
Polling requires HART protocol over the Bell 202 physical layer. Ensure that the primary mA output
on your transmitter has been wired for HART protocol, and that the external measurement device is
accessible over the HART network.
Procedure
1.
Select
Polled Variable 1
or
Polled Variable 2
.
2.
Set
Polling Control
.
Polling Control determines how the transmitter will access the external measurement device.
Option
Description
Primary
The transmitter is the only device that will
access the external measurement device as
a primary master.
Secondary
Another device on the network will access the
external measurement device as a primary
master.
Tip
If you set up polling for both temperature and pressure, use the same
Polling Control
option for both.
If you do not,
Primary
will be used for both devices.
3.
(ProLink II only) Click
Apply
to enable the polling controls.
4.
Enter the device tag of the external measurement device.
5.
Set
Process Variable
to
Pressure
.
Postrequisites
Verify that the transmitter is receiving the external data. To do this:
• Using ProLink II, click
ProLink→Process Variables
and check the
External Pressure
value.
• Using the Field Communicator, select
Overview→Primary Purpose Variables
If the value is not correct:
1. Verify the HART tag of the external device.
2. Verify that the external device is powered up and online.
3. Verify the HART/mA connection between the transmitter and the external measurement device.
Configuration and Use Manual
149
Содержание Micro Motion 9739 MVD
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Страница 230: ...Using the transmitter display Figure C 4 Offline menu version information 224 Micro Motion 9739 MVD Transmitters ...
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Страница 234: ...Using the transmitter display Figure C 8 Offline menu Simulation loop testing 228 Micro Motion 9739 MVD Transmitters ...
Страница 236: ...Using the transmitter display Figure C 10 Offline menu Zero 230 Micro Motion 9739 MVD Transmitters ...
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Страница 245: ...Using the Field Communicator with the 9739 MVD transmitter Figure E 2 Overview menu Configuration and Use Manual 239 ...