Yokogawa digitalYEWFLO (DY) - Manual (Page 58)

MAINTENANCE
IM 1F2B4-01-YIA
Page 62
4.1.4 Simulating an output/performing a loop check
The YEWFLO provides the flexibility to simulate an output to perform a loop test. This feature can be
used for Analog output or Pulse output configurations.
Analog Output - simulate output (parameter B02:OUTPUT must be set to 4-20 mA DC)
BT200 handheld terminal BT100 handheld terminal
F :TEST From the menu screen scroll down to the
F: TEST choice. Press ENTER. Depress the m e
nu until the F: TEST menu
is displayed.
F01: OUT ANALOG
50 Select F01: OUT ANALOG parameter. Press
ENTER. Press the prmtr once to display
parameter F01: OUT ANALOG.
Using the numeric keys, enter the value of percent of span you wish to simulate. i.e. 50%
Press ENTER twice. Press the ENT twice.
The current output, and the percent of rate display will agree with the value entered in
parameter F01. However, the engineering units display and totalization will continue to read
and totalize the actual flowrate.
Note: Two methods cause the simulated output to return to normal flow reading.
1) Press the F4 (ESC) function key. Move to any other menu or parameter, by
pushing the MENU or PRMTR key.
2) After 10 minutes the output will automatically return to normal.
Pulse Output - simulate output (Parameter B02:OUTPUT must be set to PULSE)
BT200 handheld terminal BT100 handheld terminal
F :TEST From the menu screen scroll down to the
F:TEST choice. Press ENTER. Depress the menu key until the F:Test menu
is displayed.
F01: OUT pulse
2000 Scroll down to parameter F02: OUT PULSE.
Press ENTER. Press the prmtr twice to display F02:
Out Pulse.
Use the numeric keys, enter the frequency value in Hertz you wish to simulate. i.e. 2000 Hz.
Press ENTER twice. Press the ENT twice.
The frequency output will respond to the value entered. Note: The pulse output, will agree
with the value entered in parameter F01. However, the percent of span display, engineering
units display and totalization will continue to read the actual flowrate.
Two methods cause the simulated output to return to normal flow reading.
1) Press the F4 (ESC) function key. Push the Me nu or PRMTR key to move
to another menu or parameter.
2) After 10 minutes, the output will automatically return to normal.