The HART Communicator informs
the user that the maintenance
flags have been reset when the
transmitter has replied to the
reset command. The user must
acknowledge this information by
pressing OK to continue.
The user is then notified that
the loop may now be returned
to automatic control. After the
user presses OK the HART
Communicator returns to the
Diagnostics screen.
The user must use the left arrow
to return to the Diag/Service
screen.
If the user selects Loop test
from the Diag/Service screen, a
procedure will begin that will allow
the user to set the loop current to
a value desired to perform a loop
test function.
If the user wishes to specify a loop
current other than 4mA or 20mA,
he must select the option Other
and then press the ENTER key.
The HART Communicator will then
command the transmitter to set the
loop current to 4mA and then it will
dynamically read the value of loop
current that the transmitter has
applied. To return to the previous
screen, the user must press OK.
The procedure is exactly the same
for the 20mA selection option
The user is presented with four
selections as shown on the
screen. The 4mA and 20mA
selections will set those values
while selecting Other will require
the user to input the exact loop
current that is desired. The
procedure will be exited if the user
selects End. The example shows
the user selection 4mA. The user
must press ENTER before the
procedure continues.
When the user selects the
Loop test option, the HART
Communicator displays the
warning message that the loop
should be removed from automatic
control during this procedure.
The user must then input the exact
value of loop current desired. After
entering the value, he must press
ENTER before the procedure
continues. For example, the value
12.00 is input on the screen to the
left.
The HART Communicator will then
command the transmitter to set the
loop current to 12.00mA and then
it will dynamically read the value
of loop current that the transmitter
has applied. To return to the
previous screen, the user must
press OK.
To exit the Loop test procedure,
the user must select the option
End and then press the ENTER
key.
The HART Communicator
then issues the command to
the transmitter to return to the
measurement mode as it was
before entering Loop test.
The user is then notified that
the loop may now be returned
to automatic control. After the
user presses OK the HART
Communicator returns to the Diag/
Service screen.
If the user selects Calibration from
the Diag/Service screen, a number
of menu selections are available.
The user must now select the type of
calibration he desires to perform.
The Scaled D/A trim will adjust
the transmitter so that its current
output at the 4.00mA and 20.00mA
output values will agree with the
plant standard current meter.
10
