Micro Motion CDM100P - Configure the Pressure Input Using the Field Communicator

Option Description Setup
Polling The meter polls an external de-
vice for pressure data.
a. Set Line 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.
d. Set External Device Tag to the HART tag of the temperature
device.
Digital communica-
tions
A host writes pressure data to
the meter at appropriate inter-
vals.
a. Set Line 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.
Postrequisites
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 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.
Related information
Set up the API referral application
4.4.2 Configure the pressure input using the
Field Communicator
Pressure data is required for several different measurements. The meter does not measure
pressure. There are several different methods to obtain pressure data.
Prerequisites
You must be using gauge pressure.
If you plan to poll an external device, the primary mA output must be wired to support
HART communications.
Procedure
1. Choose Configure > Manual Setup > Measurements > External Inputs > Pressure.
Configure process measurement
Configuration and Use Manual 35