Yokogawa YTA320 - Manual (Page 21)

<3. Part Names and Functions>
3-2
IM 01C50B01-01E
3.2 Setting the Hardware Error
Burnout Change-over Switch
The temperature transmitter is equipped with a
hardware error burnout function used to set the
output direction upon hardware error, and a sensor
burnout function that sets the direction of the output
in the event of burnout of the temperature sensor.
When factory-shipped under normal conditions,
the output of both hardware error burnout and
sensor burnout are set to HIGH, but if suffix code
/C1 is specified, the hardware error burnout is set
to LOW (-5%) output, and sensor burnout is set to
LOW (-2.5%) output, respectively. The setting of the
direction of output from burnout can be changed.
To change the direction of output arising from
burnout, switch the setting pin on the CPU
assembly (see Figure 3.1 and Table 3.1). To change
the direction of output arising out of sensor burnout,
a dedicated hand-held terminal is required to
rewrite the parameters within the transmitter. For
details, refer to the separate instruction manual, IM
01C50T01-01E “HART Protocol” or IM 01C50T03-
01E “BRAIN Protocol”.
Table 3. Output Direction Setting Pins for
Hardware Error Burnout
T0301.ai
H
L
H
L
Pin
position
Remark Hardware error
burnout
direction
HIGH
LOW
110% or more
(21.6 mA DC)
-5% or less
(3.2 mA DC)
Set to HIGH upon
shipment from the
factory
Set to LOW when
suffix code /C1
is provided
Hardware error
burnout
output
3.3 Built-in Indicator Display
Function
F0302.ai
Output bar chart display
Communication protocol display
Operation mode
display
Display of sensor type and
number of wire connections
Unit display
Process variable display
Input display
Figure 3.2 Built-in Indicator Display Function
() Output bar chart display
The output value is displayed in a bar chart.
Resolution of the bar chart is to the extent of 32
divisions (each increment is about 3.125%). If the
output exceeds 0% or 100%, ▼is lit. The bar chart
can be toggled ON/OFF using the bar chart display
parameter.
(2) Communication protocol display
The indicator is on in accordance with each
communication protocol.
(3) Operation mode display
Lit when each operation mode is activated.
M.D.: Lit when the multidrop mode of HART
communication specification is activated.
B.M.: Lit during burst mode transfer of HART
communication specification.
F.O.: Lit when manual mode is active.
W.P.: Lit when write protect status is active.
(4) Input display
Indicates the type of input in accordance with the
value shown in the column in Item (5).
Sns1: Meant to show the process variable allocated
to Sensor 1.
Sns2: Meant to show the process variable allocated
to Sensor 2. (Can be displayed only with the
YTA320.) .
Term: Meant to show the temperature of the
terminal box of the temperature transmitter.
Avg: Meant to show the average of the process
variable allocated to Sensor1 and Sensor2.
(Can be displayed only with the YTA320.).
Dif: Meant to show the difference of the process
variable allocated to Sensor1 and Sensor2.
(Can be displayed only with the YTA320.)
(5) Process variable display
Displays the process variable or output value. The
value is displayed down to the second decimal
position if the integer part is less than three digits,
or down to the first decimal position if the integer
part is 4 digits. If the value is negative, the minus (−)
sign is lit. For process variables, the indicators for
each item specified in the column of input display in
Item (4) and the unit column in Item (6) are lit. For
output value, % or mA in the unit column in Item (6)
is lit. When burnout of the temperature sensor is
identified, or the temperature transmitter is found
abnormal, an error code flashes.