Rockwell Automation 1771-IL Installation Instructions User Manual
Page 15
Isolated Analog Input Module
15
Publication 1771Ć5.62 - November 1998
The following are major differences between series levels of the
1771-IL isolated analog input module.
Description
Series A
Series B
Series C and Series D
Data Table Usage
8 in/8 out/12 read words/19 write
words
8 in/8 out/15 read words/37 write words
Resolution
12Ćbit binary
16Ćbit binary
Sample Time
No RTS, Default 500ms; range
500ms to 3.1s in 100ms increments
No RTS, Default 50ms; range 50ms to 3.1s in 100ms increments
Calibration
Mechanical adjustments for gain,
offset and zero offset.
AutoĆcalibration (offset and gain)
Zero offset and gain adjustment for each channel via programming
terminal
Accuracy
0.1% of full scale range @ 25
o
C
Voltage: Typical Ć 0.01% of full scale range @ 25
o
C
Maximum Ć 0.05% of full scale range @ 25
o
C
Current: Typical Ć 0.06% of full scale range @ 25
o
C
Maximum Ć 0.1% of full scale range @ 25
o
C
(Includes 0.05% when using internal current resistor)
Common Mode Rejection
>120 db @ 60Hz and 1Kohm source
imbalance
>150 db @ 60Hz and 1Kohm source imbalance
Normal mode rejection
>120 db @ 60Hz
>60 db @ 60Hz
Input Overvoltage Protection
+40V peak, continuous
voltage mode: 140V ac (rms) continuous;
current mode: 8V dc continuous
Backplane Current
1.3A @ +5V
1.0A @ +5V
1.1A @ +5V
Power Dissipation
6.5 Watts maximum
5.0 Watts maximum
5.5 Watts maximum
Thermal Dissipation
22.2 BTU/hr maximum
17.1 BTU/hr maximum
18.8 BTU/hr maximum
Insternal Scan Rate
500ms for 8 channels (no scaling or
digital filtering)
50ms for 8 channels (no scaling or digital filtering)
Engineering Units sent to
Processor
+9999 BCD with selectable scaling
+9999 BCD with selectable scaling
+32767 binary
Agency Cerfification
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
Differences Between
Series A, Series B, Series
C and Series D