A - specifications, Specifications, Appendix – Rockwell Automation 1771-IR , D17716.5.76 RTD INPUT MODULE User Manual
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Appendix
A
A-1
Specifications
Module Capacity
Six RTD input channels
Module Location
1771 I/O Chassis
Sensor Type
100 ohm platinum (alpha = 0.00385) or 10 ohm copper (alpha =
0.00386)
Other types may be used with report in ohms only
Units of measure
Temperature in
o
C
Temperature in
o
F
RTD resistance in ohms (10milliohms or 30milliohms resolution)
Temperature Range
Platinum: -200 to +870
o
C (-328 to 1598
o
F)
Copper: -200 to +260
o
C (-328 to +500
o
F)
Resistance Range
1.00 to 600.00 ohms
Resolution
Platinum: 0.1
o
C (0.1
o
F)
Copper: 0.3
o
C (0.5
o
F)
Sensor Excitation
1mA constant current source supplied by module
Input Isolation Dielectric Test
1000V peak channel to channel, channel to backplane, for 1 second
Common Mode Rejection
120db @ 60Hz up to 1000V peak
Common Mode Impedance
Greater than 10 megohms
Normal Mode Rejection
60db @ 60Hz
Input Overvoltage Protection
120V rms continuous
Open RTD Response Time
Open excitation (terminal A) to overrange: <0.5sec
Open common (terminal C) to underrange: <0.5sec
Open sense (terminal B): drift high
Scan Time (all 6 channels)
50ms
Environmental Conditions
Operating Temperature
Rate of Change
Storage Temperature
Relative Humidity
0 to 60
o
C (32 to 140
o
F)
Ambient changes greater than 1.0
o
C/minute may temporarily
degrade performance during periods of change.
-40 to 85
o
C (-40 to 185
o
F)
5 to 95% noncondensing
Backplane Power Consumption
4.25W maximum, 0.85A at 5V
Keying
Between 10 and 12
Between 28 and 30
Field Wiring Arm
Cat. No. 1771-WF