Emerson 9739 Manuel D’Utilisation

Update Rate

 controls the rate at which process data is polled and process variables are

calculated. Update Rate = Special produces faster and “noisier” response to changes in the
process. Do not use Special mode unless required by your application.

Before setting Update Rate to Special:

•

Check the effects of Special mode on specific process variables.

•

Contact Micro Motion.

Set Update Rate as desired.

Normal

All process data is polled at the rate of 20 times per second (20 Hz).
All process variables are calculated at 20 Hz.
This option is appropriate for most applications.

Special

A single, user-specified process variable is polled at the rate of 100 times per second
(100 Hz). Other process data is polled at 6.25 Hz). Some process, diagnostic, and calibra-
tion data is not polled.
All available process variables are calculated at 100 Hz.
Use this option only if required by your application.

If you change Update Rate, the settings for Flow Damping, Density Damping, and Temperature
Damping

 are automatically adjusted.

Effects of Update Rate = Special

Special

 mode is not compatible with the following features and functions:

•

Enhanced events. Use basic events instead.

•

All calibration procedures.

•

Zero verification.

•

Restoring the factory zero or the prior zero.

If required, you can switch to Normal mode, perform the desired procedures, and then
return to Special mode.

Some process variables are not updated when Special mode is enabled.

Configure device options and preferences

74