Yokogawa Wireless Temperature Transmitter YTA510 - Manual (Page 74)

A2-5
IM 01C50T02-01E
Access the parameter SENSOR_TYPE_1 and set
204 (sensor match). Then, access the parameter
SENSOR_CONNECTION_1 and set the number of
connection wires for the RTD used.

Access the parameter SENSOR_MATCH_R0_1 and
set the resistance of the RTD at 0°C.

Access the parameters
SENSOR_MATCH_ALPHA_1, SENSOR_MATCH_
DELTA_1, and SENSOR_MATCH_BETA_1 and set
the values of the sensor-inherent constants α, δ, and β,
respectively.
A2.4 Setting Up AI Blocks
AI blocks are used to perform temperature output
processing. Since each of the four AI blocks
in a YTA320 has independent parameters, set
the parameters for each AI block you use. The
following shows the procedure to set up the AI1
block for example.
(1) Setting the Channel
Select the value to be input from the transducer
block.
Access the parameter CHANNEL, and set the number
corresponding to the value you want to input.
1 = PRIMARY_VALUE_1(Sensor 1 input)
2 = PRIMARY_VALUE_2(Sensor 2 input)
3 = SECONDARY_VALUE (Terminal board
temperature)
4 = DIFFERENTIAL_VALUE (Temperature
difference between sensors 1 and 2)
5 = AVERAGE_VALUE (Average temperature of
sensors 1 and 2 )
6 = BACKUP_VALUE (Backup temperature)
(2) Setting the Measurement Range
Access the parameter XD_SCALE, and do the
following:
• Set the upper range limit for EU at 100% inside
XD_SCALE.
• Set the lower range limit for EU at 0%.
• Set the code of the desired unit for Units Index.
For example, to measure a 0 to 200°C temperature,
set:
• 200 for EU at 100% in XD_SCALE.
• 0 for EU at 0% in XD_SCALE.
• 1001 for Units Index in XD_SCALE
(see notes below).
Note 1: For the unit, set the four-digit number code that
represents the index to the desired unit. See Table
A1.5 for the correspondence between the four-digit
number codes and units.
Note 2: Set the same unit for the AI block as that set for the
transducer block.
(3) Setting the Output Scale
Access the parameter OUT_SCALE, and do the
following:
• Set the output value corresponding to the upper
measurement range limit for EU at 100% inside
OUT_SCALE.
• Set the output value corresponding to the lower
measurement range limit for EU at 0%.
• Set the code of the desired unit for Units Index.
For example, to set the output range to 0 to 100%,
set:
• 100 for EU at 100% in OUT_SCALE.
• 0 for EU at 0% in OUT_SCALE.
• 1342 for Units Index in OUT_SCALE.
Limitation Imposed by Built-in LCD
For a YTA320 with a built-in LCD, the output
scale settings in OUT_SCALE apply to the scale
and unit of the indication on the LCD when the
corresponding AI is selected to be displayed and
the output mode (L_TYPE) is set to Indirect or
IndirectSQRT. In this case, the upper and lower
output values to be set for EU at 100% and EU at
0% inside OUT_SCALE must be numbers within
a range of –9999.9 to 9999.9. (When L_TYPE is
Direct, the unit set in XD_SCALE is displayed.)
The following units can be displayed on the LCD.
Display Unit Unit Index
Kelvin 1000
°C 1001
°F (Note) 1002
°R (Note) 1003
mV 1243
ohm 1281
mA 1211
% 1342
Note: Available only when optional code /D2 is specified.
(4) Setting the Output Mode
Access the parameter L_TYPE, and set the output
mode:
1 = Direct (direct output of input from transducer)
2 = Indirect (linear scaling)
3 = IndirectSQRT (square root extraction)