<7. HART Communication>
7-19
IM 01C25W05-01EN
7.2.3.16 Test Output, Simulation, and
Squawk
IMPORTANT
Test output,device variable simulation and status
simulation are held for a certain time period and
then released automatically.
Even if the HART configuration tool is closed or
the communication cable is disconnected while
executing the above test, they are held for a
certain time period.
Retention time
Factory
default
10 minutes
Changeable
time period
Select from 10 minutes, 30 minutes, 60
minutes, 3 hours, 6 hours, 12 hours.
Recalling configuration change parameters
Recall
parameters
[Root menu] → Diag/Service → Test
device → Test Auto Release Time
(1) Test output/loop test
It is possible to output constant current that follows
the analog signal output’s low limit (AO lower limit)
and the analog signal output’s high limit (AO upper
limit) settings within the 3.8 mA (–1.25%) to 21.6
mA (110%) range for loop checking. (For setting the
analog signal’s high and low limits, see subsection
7.3.3.5.)
While this function is running, “TEST” is shown in
the lower part of the integral indicator.
To perform test output, recall the test output
parameter (Loop Test), and select from the following
three types.
• Recalling constant current output parameters
Recall
parameters
[Root menu] → Diag/Service → Test
device → Loop test (method)
4 mA
Outputs a 4 mA DC constant current
20 mA
Outputs a 20 mA DC constant current
Other
Outputs a specified current
End
End
To perform test output from the DTM, recall Loop
Test from Hot key menu, select manual test or auto
test in the figure on the screen, and set the value.
(2) Device variable simulation
A value and status of your choice can be assigned
to a device variable, and its output can be
confirmed.
When the parameter is recalled, a message
is displayed, so follow them. When step 5 is
completed, simulation begins. This reading and
alarm (AL.91) are displayed alternately on the
integral indicator.
• Device variable simulation execution procedure
Step
1
Recall
parameters
[Root menu]
→ Diag/Service → Test device
→ Device vars simulate (method)
2
Select Device
Variable.
Select from the following
parameters.
Off
Differential pressure (DP)
Module 1 side pressure (Pres 1)
Module 2 side pressure (Pres 2)
Module 1 side capsule
temperature (Temp 1)
Module 2 side capsule
temperature (Temp 2)
Percentage (PV % range)
Current (Loop current)
3
Set Value.
Enter the simulation value.
The preset unit is used.
4
Set Data
quality.
Select from the following
parameters.
Bad
Poor accuracy
Manual / Fixed
Good
5
Set Limit
status.
Select from the following
parameters.
Not limited
Low limited
High limited
Constant
NOTE
• The differential pressure, pressure, and
capsule temperature simulation is applied
to the output. Current output value, integral
indicator display value, and communication
output value are those that correspond to
the simulation values. If alarms are set,
alarms are output according to the simulation
values.
• For differential pressure and pressure
simulations, the damping setting is applied.
If a value changes, the value changes
according to the damping time constant.
