Yokogawa Wireless Temperature Transmitter YTA510 - Manual (Page 27)

<5. Configuration>
5-14
IM 01C50T02-01E
CAL_POINT_HI_1 (2), CAL_POINT_LO_1 (2)
These parameters store the calibrated upper
and lower range limit values for sensor input
1 (or 2). To perform a calibration, apply a
voltage (for a thermocouple or voltage input)
or a resistance (for a RTD or resistance input)
between the corresponding input terminals,
and write the applied level to these parameters.
The values written must meet the following
conditions:
CAL_POINT_HI_1 > CAL_POINT_LO_1
CAL_POINT_HI_2 > CAL_POINT_LO_2
The table below shows the recommended input
levels for calibrations.
Table 5.16 Recommended Input Levels for
Calibration
Input Type
Sensor
Type
Input
Low Level
(CAL_POINT_
LO_1/2)
High Level
(CAL_POINT_
HI_1/2)
Thermocouple Type B, R, S,
or T
0 mV 25 mV
Type E, J, K,
N, W3, W5,
L, U
0 mV 75 mV
RTD Pt100,
JPt100,
Ni120, Cu
40Ω 330Ω
Pt200, Pt500 40Ω 1600Ω
DC mV mV 0 mV 75 mV
Resistance Ohm 40Ω 1600Ω
5.6.5 Parameters of AI Function Block
Parameters of function blocks can be read and
written from a host computer. See Appendix 1 for
a list of all parameters of the YTA320. For a model
incorporating the PID function block and link master
feature, see Appendixes 4 and 5. This section
describes only the settings for important parameters
of each AI block.
MODE_BLK
Supports O/S, Auto, and Manual modes. The
AI block does not function in the O/S mode,
does not update the measured value in the
Manual mode, and updates the measured
value in the Auto mode. Normally, set the mode
to Auto. Before the YTA320 is shipped from the
factory, AI1 and AI2 are set to Auto mode, and
AI3 and AI4 to O/S.
NOTE
The CHANNEL of unused blocks are
recommended to set to ‘3’ (SECONDARY_
VALUE).
CHANNEL
Selects the input to the AI block from the
transducer. The table below shows the input
value depending on the setting of CHANNEL.
Set CHANNEL according to the value you want
to input to the AI block.
Table 5.17 Input Selected by CHANNEL Setting
CHANNEL
Setting
Input Selected
1 Sensor 1 input (PRIMARY_VALUE_1)
2 Sensor 2 input (PRIMARY_VALUE_2)
3 Terminal board temperature
(SECONDARY_VALUE)
4 Temperature difference between sensors
1 and 2 (DIFFERENTIAL_VALUE)
5 Average temperature of sensors 1 and 2
(AVERAGE_VALUE)
6 Backup temperature (BACKUP_VALUE)
XD_SCALE
Stipulates the range of the input from the
transducer. The customer-specified range (or
the default range if the range was not specified
when ordering) is set before the YTA320 is
shipped from the factory.
If the unit of the input temperature value is
set as mV or ohm in the transducer block
and the unit of XD_SCALE is set as a unit of
temperature (e.g., °C), or vice versa, the status
becomes Uncertain or Bad. It is recommended
to set the same unit for the transducer block
and AO blocks.
L_TYPE
Stipulates the calculation in the AI block.
Setting L_TYPE to:
· “Direct” puts the value that is input to
CHANNEL, in OUT as is.
· “Indirect” performs scaling of the input value
based on XD_SCALE and OUT_SCALE and
puts the scaled value in OUT.
· “IndirectSQRT” performs scaling of the input
value based on XD_SCALE, extracts the
square root of the scaled value, performs
scaling of the square root, and then puts the
scaled value in OUT.