Specifications – Rockwell Automation 1771-IR INSTL.INSTR RTD INPUT MODULE User Manual
Page 11
RTD Input Module
11
Publication 1771-5.50 – October 1996
Description
Value
Number of Inputs
6 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
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
50ms for 6 channels
Isolation Voltage
This isolation meets or exceeds the requirements of UL
Standard 508, and CSA Standard C22.2 No. 142.
Backplane Current
950mA at 5V
Power Dissipation
4.75W maximum
Thermal Dissipation
16.2 BTU/hr
Environmental Conditions
Operating Temperature:
Rate of Change:
Storage Temperature:
Relative Humidity:
Operating
Storage
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
5 to 95% noncondensing
Keying
Between 10 and 12
Between 28 and 30
Field Wiring Arm
Cat. No. 1771-WF
Wiring Arm Screw Torque
7-9 inch-pounds
Specifications continued on next page
Specifications