<3. Parameter Setting>
3-7
IM 01C50T03-02EN
3.2.4 Unit
A unit of the terminal block temperature can be
set for process variables PV to QV, Sensor1, and
Sensor2 (the 2-input model only).
Set the following parameters. When the unit is set, it
is used to display the parameters that are shown in
the “affecting parameters” column.
Target
Parameter
Affecting parameter
PV
B11:PV UNIT
A10, E10 to 11
SV
B21:SV UNIT
A20
TV
B31:TV UNIT
A30
QV
B41:QV UNIT
A40
Sensor1
D13:SENSOR1
UNIT
D12, H10 to H12,
I11 to I15, P10 to 11
Sensor2
D33:SENSOR2
UNIT
D32, H20 to H22,
I21 to I25, P12 to 13
Terminal block
Temperature
B51:TERM UNIT A50, H30 to 32,
P14 to P15
Select a unit from the following options.
Option
Unit
Description
degC
°C
Degrees centigrade
K
K
Kelvin
degF
°F
Degrees Fahrenheit
degR
°R
Degrees Rankine
NOTE
If the target unit is DC voltage, the unit “mV”
is used to display the parameter values in the
“Affecting parameters” column, regardless of the
above unit setting. Similarly, the unit of resistance
is set to “ohms”.
NOTE
The units of PV to QV are fully independent of the
units of Sensor1, Sensor2 (for 2-input model only),
and terminal block temperature. For example,
even if Sensor1 is mapped to the PV, the unit
used for PV display is the unit that has been set
by “B11:PV UNIT”. It is not affected by the unit of
“D13:SENSOR1 UNIT”.
3.2.5 Range Setting
The range setting refers to assigning an output
range of 4 to 20 mA to an area (LRV to URV) within
the PV digital output range (LSL to USL).
F0303.ai
LSL
PV output
LRV
URV
USL
Analog output
Calculation output
lower limit
(3.6 mA or more)
4 mA
(0%)
20 mA
(100%)
Calculation output
upper limit
(21.6 mA or less)
However, the following restrictions apply when
setting the range.
• Both LRV and URV must be within the
range between LSL (lower limit of the sensor
measurement range) and USL (upper limit of
the sensor measurement range).
• The width of LRV and URV must be greater
than the minimum span of sensors.
For the measurement range and minimum span
for each sensor type, see Chapter 7 “Standard
Specifications” in IM 01C50G01-01EN document.
NOTE
If the PV value is outside the range of LRV to URV,
the current below 4 mA or the current above 20
mA is output. In this case, the output is calculated
in the same ratio. However, even in this case,
the upper and lower limit values of the current
to be output are limited to the range between
the computation output lower limit value and the
computation output upper limit value.
NOTE
The LRV can also be set to a value larger than
URV. In this case, the output is inverted, and the
output current falls when the PV value increases.
