Omron CJ Series Operation Manual page 122

3 Isolated-type Universal Input Units
Item
Applicable standards for resis-
tance thermometer and thermo-
couple inputs
Scaling
Process data
Accuracy (25°C)
Temperature coefficient
Cold junction compensation error Thermocouple input: ±1.2°C
Resolution
Input signal range
Influence of lead wire resistance
Input detection current
Absolute maximum ratings
Input impedance
Input disconnection detection
current
3-18
Pt100: JIS C1604-1997, IEC 60751-95
JPt100: JIS C1604-1989
K, J, T, E, N, R, S, B: JIS C1602-1995
L, U: DIN 43710-1985
WRe5-26: ASTM E988-96
PLII: ASTM E1751-00
It is possible to scale process data (with user-set minimum and maximum values for
data and offsets). The inputs are set individually.
Data can be converted at 0% to 100%.
The values derived from carrying out the following processing in order of the actual pro-
cess data in the input range are output as a 16-bit integer (INT) or 32-bit integer (DINT).
1) Averaging → 2) Scaling → 3) Zero/span adjustment → 4) Square root calculation →
5) Offset compensation → 6) Output limits
Resistance thermometer or thermocouple input:
±0.05% (The accuracy depends on the input type and the measured temperature.
For details, refer to the Accuracy and Temperature Coefficient According to Resis-
tance Thermometer and Thermocouple Input Types and Measured Temperatures on
page 3-24.)
Current or voltage input: ±0.05%
Potentiometer input: ±1%
Resistance thermometer or thermocouple input:
The temperature coefficient depends on the input type and the measured tempera-
ture. For details, refer to the Accuracy and Temperature Coefficient According to
Resistance Thermometer and Thermocouple Input Types and Measured Tempera-
tures on page 3-24.
Current or voltage input: ±80 ppm/°C (for full scale)
Potentiometer input: ±100 ppm/°C (for full scale)
1/256,000 (Conversion cycle: 60 ms) *, 1/64,000 (Conversion cycle: 10 ms), 1/16,000
(Conversion cycle: 5 ms)
* The resolution for a potentiometer input is 1/4,000.
Resistance thermometer, thermocouple, ±100 mV user-set input:
−15% to 115% of measurable input range
4 to 20 mA, 1 to 5 V, 0 to 1.25 V, 0 to 5 V, 0 to 10 V input:
−15% to 115%
0 to 20 mA input:
0% to 115%
−1.25 to 1.25 V, −5 to 5 V, −10 to 10 V, ±10 V user-set range input:
−7.5% to 107.5%
Potentiometer input:
−15% to 115% of 0 to 2,500 Ω
Platinum resistance thermometer input:
0.06°C/Ω (20 Ω max.) (3-wire)
0.006°C/Ω (20 Ω max.) (4-wire)
Platinum resistance thermometer input: Approx. 0.21 mA (3-wire), approx. 0.42 mA (4-
wire)
Potentiometer input: Approx. 0.21 mA
Thermocouple, ±100 mV user-set range input: ±130 mV
Current input: 30 mA
Voltage input (excluding ±100 mV user-set range): ±15 V
Thermocouple, ±100 mV user-set range input: 20 kΩ min.
Current input: 150 Ω max.
Voltage input (excluding ±100 mV user-set range): 1 MΩ min.
Thermocouple, ±100 mV user-set range input: Approx. 0.1 µA
CJ-series Analog I/O Units Operation Manual for NJ-series CPU Unit(W498)
Specifications