Emerson Rosemount 3101, Reference Manual

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172
Reference Manual
00809-0100-4840, Rev CB
Appendix F: Programming the 3102 and 3105 using HART
February 2015
Programming the 3102 and 3105 using HART
F.3.28 Lost echo action (P022)
This defines what happens to the process value (PV) and output current when a “lost echo”
condition exists (see
page 170 ).
“MINIMUM” action
The PV is forced to zero while a “lost echo” condition exists.
In addition, the two-wire loop current changes to indicate this condition (see "Selecting the Lost
Echo action (on the 3102/3105)" on page 51 ). The current remains at that level until the correct
target echo is recovered.
“MAXIMUM” action
The PV is forced to the maximum while a “lost echo” condition exists. The maximum PV is the
value that occurs when an echo is received from the transmitter face.
In addition, the two-wire loop current changes to indicate this condition (see "Selecting the Lost
Echo action (on the 3102/3105)" on page 51 ). The current remains at that level until the correct
target echo is recovered.
“HOLD” action
The current output is held at the last good PV value.
Field Communicator or AMS Device Manager
To view or change the lost echo action
1. From the Home screen, select 2: Configure.
2. Select 2: Manual Setup.
3. Select 5: Engineering ( 3105 ) or
6: Engineering ( 3102 ).
4. Select 2: Lost Echo Action P022.
5. If a change is required:
(a) Select a new action, and then select “ENTER” to save it.
(b) Select “Send” or “Apply” to update the transmitter.
Note
When messages appear, take appropriate action if needed and select “OK”.
Fast Keys
2, 2, 5 [or 6], 2
Lost Echo Action P022
Hold
Minimum
Hold
Maximum
Hold
ENTER ESC
( Field Communicator Screen Shown )