Omron SYSMAC CJ1W-AD04U, Operation Manual

Page: 32 / 76

13
Input Types and Data Conversion Section 2-2
Temperature Inputs
The measured temperature error is calculated as shown in the following
example.
Example:
Overall accuracy =
Reference ac Temperature characteristic
×
Change in ambient tem-
perature =
±
1.5
°
C + (
±
0.13
°
C)
×
5
°
C
=
±
2.2
°
C
±
1 digit.
Input Function Block Diagram
The following calculations can be performed in series on the converted pro-
cess value, and the resulting value can be transferred to the CPU Unit as the
converted value. Since the adjustments are performed in the Unit, there is no
need to process the data in the CPU Unit’s ladder program.
Sensor type DM Area
setting
Measurable input range
°
C
°
F
Resistance ther-
mometers Pt100 0 (0000 hex)
−
200.0 to 650.0
−
300.0 to 1200.0
JPt100 3 (0003 hex)
−
200.0 to 650.0
−
300.0 to 1200.0
Pt1000 7 (0007 hex)
−
200.0 to 650.0
−
300.0 to 1200.0
Thermocouples K 21 (0015 hex)
−
200.0 to 1300.0
−
300.0 to 2300.0
J 23 (0017 hex)
−
100.0 to 850.0
−
100.0 to 1500.0
T 25 (0019 hex)
−
200.0 to 400.0
−
300.0 to 700.0
L 33 (0021 hex)
−
100.0 to 850.0
−
100.0 to 1500.0
R 36 (0024 hex) 0.0 to 1700.0 0.0 to 3000.0
S 37 (0025 hex) 0.0 to 1700.0 0.0 to 3000.0
B 38 (0026 hex) 100.0 to 1800.0 300.0 to 3200.0
Item Details
Ambient temperature 30
°
C
Thermocouple type K
Measured tempera-
ture (PV) 500
°
C
Reference accuracy
(25
°
C)
±
0.3
°
C of PV or
±
1.5
°
C, whichever is greater,
±
1 digit.
In this example,
±
1.5
°
C
Temperature charac-
teristics When the coefficient is
±
100 ppm FS/
°
C, the characteristic in
this example is 100 ppm
×
1300
°
C = 0.13
°
C
Change in ambient
temperature 25
°
C
→
30
°
C = 5
°
C
Analog input 1
Analog input 2
Analog input 3
Analog input 4
A/D
conver-
sion
Sensor
error
detection
Scaling
Zero/span
adjustment
PV alarm
comparison
Analog input 1
process value
Analog input 2
process value
Analog input 3
process value
Analog input 4
process value
Universal Input Unit
CPU Unit
Special I/O Unit Area
I/O refresh
Same as above.
Same as above.
Same as above.
Input
calcula-
tions