Emerson Rosemount 327T, Быстрый старт

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• OFF: Allows all diagnostic messages. The temperature transmitter will signal all
diagnostic cases.
For more information, see Diagnostic cases .
To signal a diagnostic case, the temperature transmitter interrupts the transfer of
temperature measurements and provides these analog outputs using FOU2:
• ON: 21.5 mA
• OFF: 3.5 mA
Note
In a two-wire operation, the temperature transmitter does not provide diagnostic
messages in the event of low voltage.
Diagnostic function (three-wire)
In three-wire operation, the temperature transmitter uses an analog output for
temperature measurement and a switching output for diagnostics and IO-Link
communication.
drEd configures which diagnostic messages the temperature transmitter uses to indicate
failures.
• ON: Signals only failure diagnostic messages for the analog and switching outputs
(cases 7-9).
• ONdr: Signals only failure diagnostic messages (cases 7-9) for the analog output and
alarm and failure diagnostic messages (cases 3-9) for the switching output.
• OFF: Signals only failure diagnostic messages (cases 7-9) for the analog output and all
diagnostic messages (cases 1-9) for the switching output.
Note
Using the switching output in three-wire operation for diagnostics results in the analog
output being disrupted only if a failure is seen. This ensures maximum use of the analog
output.
dOU1 is used to define how the diagnostic output reacts to diagnostic messages:
dOU1 Normal Warning Alarm and failure
Normally closed (nc) Closed Closed Open
Normally closed,
extended (nc+) Closed Switching open/closed
at 2 Hz
2 Hz
Open
Introduction Quick Start Guide
January 2019 00825-0100-4329
10 Quick Start Guide