V 2 0 0 - 1 8 - E 4 X B
S n a p - i n I / O M o d u l e
6 / 0 5
14
Unitronics
PT100 inputs
Input range
-200 to 600
°
C/-328 to 1100
°
F. 1 to 320
Ω
Conversion method
Voltage to frequency
Resolution
0.1
°
C/0.1
°
F
Conversion time
200mS minimum per channel, depending on software filter type
Input impedance
>10M
Ω
Auxillary current for PT100
150µA typical
Full-scale error
±0.4%
Linearity error
±0.04%
Status indication
Notes:
9.
The device can also measure resistance with the range of 1-320
Ω
at a resolution of 0.1
Ω
.
10. The analog value can indicate faults as shown below:
Value Possible
Cause
32767 - Sensor is not connected to input
- Value exceeds permissible range
- Power supply disconnected
-32767 Sensor is short-circuited
Thermocouple inputs
Input range
As shown in the table on page 15. See Note 11.
Conversion method
Voltage to frequency
Resolution
0.1
°
C/0.1
°
F maximum
Conversion time
100mS minimum per channel, depending on software filter type
Input impedance
>10M
Ω
Cold junction compensation Local,
automatic
Cold junction compensation
error
±1.5
°
C / ±2.7
°
F maximum
Absolute maximum rating
±0.6VDC
Full-scale error
±0.4%
Linearity error
±0.04%
Warm-up time
½ hour typically, ±1
°
C/±1.8
°
F repeatability
Status indication
Notes:
11. The device can also measure voltage within the range of -5 to 56mV, at a resolution of 0.01mV.
The device can also measure raw value frequency at a resolution of 14-bits(16384)
12. The analog value can indicate faults as shown below:
Value Possible
Cause
32767 - Sensor is not connected to input
- Sensor value exceeds the maximum value
- Power supply disconnected
-32767 Sensor value is under the minimum value
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