Emerson Micro Motion CDM100M A Series Configuration And Use Manual page 57

Method 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
Choose Service Tools > Variables > External Variables and verify the values for External
Temperature and External Pressure.
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Configuration and Use Manual
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.
Setup
a. Choose Configure > Manual Setup > Measurements > External Inputs
> Pressure.
b. Set Pressure Input to Enable.
c. Choose Configure > Manual Setup > Inputs/Outputs > External Device
Polling.
d. Choose an unused polling slot.
e. Set Poll Control to Poll as Primary or Poll as Secondary.
Option Description
No other HART masters will be on the
Poll as Primary
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.
f. Set External Device Tag to the HART tag of the external pres-
sure device.
g. Set Polled Variable to Pressure.
a. Choose Configure > Manual Setup > Measurements > External Inputs
> Pressure.
b. Set Pressure Input to Enable.
c. Perform the necessary host programming and communica-
tions setup to write pressure data to the transmitter at ap-
propriate intervals.
Configure process measurement
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