Rockwell Automation 1771-IR Series D RTD Input Module User Manual User Manual
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Differences Between Series A RTD Modules and Series B. C and D RTD Input Modules
F–3
Publication 1771Ć6.5.129 - March 2000
•
The excitation current on Series B flows out of termination A.
The excitation current on the series A flowed into termination A.
Systems wired according to the IR User’s Manual will work
without modification, presuming the transducer is polarity
insensitive.
•
Allowable ambient temperature change to maintain accuracy is
1
o
C/min.
Description
Series A
Series B, C and D
Use of Data Table
8 in; 8 out; 8 read words, 14 write words
8 in; 8 out; 9 read words, 15 write words
Resistance Range
18.4 to 400.00 ohms
1.00 to 600.00 ohms
Common Mode Impedance
<50 megohms shunted by <4700pF
Greater than 10 megohms
Input Overvoltage Protection
40V rms continuous
120V rms continuous
Scan Time
50ms for 6 channels
50ms for 6 channels
Real Time Sampling
None
50ms to 3.1s
AutoĆCalibration
None
Yes - Uses Block Transfer Write word 15
Open RTD Response Time
None
Open excitation (terminal A) to overrange: <0.5sec
Open common (terminal C) to underrange: <0.5sec
Open sense (terminal B): drift high
Power Dissipation
5.0W maximum
4.75W maximum
Thermal Dissipation
15.0 BTU/hr
16.2 BTU/hr
Agency Certification
(when product or packaging is marked)
•
CSA certified
•
CSA Class I, Division 2, Groups A, B, C,
D certified
•
UL listed
•
CSA certified
•
CSA Class I, Division 2, Groups A, B, C, D
certified
•
UL listed
•
CE marked for all applicable directives
•
Series D C-Tick marked for all applicable acts