Emerson Exchange 365

Hi Cliff,

I would check the configuration of the parameter called HART Polling Address. The default setting for that parameter is 0. With the address set at 0 it is in variable 4-20 mA mode. If the HART Polling Address gets set to a value of 1-15 it is in Multidrop mode. Multidrop mode is used for having multiple HART devices on the same loop. In this mode, the analog output is fixed at 4 mA. Variables are read via HART communication instead of using the 4-20 mA scale. The "Analog Output Fixed" error message is one way the transmitter lets the user know it is in Multidrop mode.

The other way the analog output can be set to a fixed value is using the Analog Output Loop Test. This is a specific maintenance test used to force the analog output to a user selected mA value. If the test isn't exited/stopped, the transmitter will remain in a fixed mA output. Cycling power will also take the transmitter out of the Analog Output Loop Test.

If you would like further support with this issue, you can also contact our Emerson Flow Support team - Flow.Support@emerson.com or 1-800-522-6277.

Best Regards,
Mike Schaefer