Specifications – Rockwell Automation 1771-IL Installation Instructions User Manual
Page 13
Isolated Analog Input Module
13
Publication 1771Ć5.62 - November 1998
Description
Value
Number of Inputs
8 fully isolated differential
Module Location
1771 I/O rack Ć 1 slot
Input voltage ranges (nominal)
+1 to +5V DC
0 to 5V DC
Ć5 to +5V DC
Ć10 to +10V DC
Input current ranges (nominal)
+4 to +20mA
0 to +20mA
Ć20 to +20mA
Resolution
16Ćbit binary over full range
Accuracy
Voltage
Current
Typical Ć 0.01% of full scale range @ 25
o
C
Maximum Ć 0.05% of full scale range @ 25
o
C
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)
Temperature Coefficient
+50ppm/
o
C of full scale range
Linearity
+1 LSB
Repeatability
+1 LSB
Isolation Voltage
This isolation meets or exceeds the requirements of UL
standard 508, and CSA standard C22.2 No. 142.
Input overvoltage protection
voltage mode: 140V ac (rms) continuous;
current mode: 8V dc continuous
Unscaled BCD and binary output
data to the processor
0000 to +4095
10
for unipolar ranges
(0 to 5V, +1 to +5V, 0 to +20mA, and +4 to +20mA)
Ć4095
10
to 4095
10
for bipolar ranges
+5V, +10V, +20mA input ranges
Input impedance
>10 megohms for voltage ranges; 250 ohms for current
ranges
Common mode rejection
>120 db @ 60Hz and 1K ohm source imbalance
Common mode impedence
>50 megohms shunted by <5 nF
Normal mode rejection
>60 db @ 60Hz
Open Circuit Detection
Voltage mode
Current mode
Open input produces upscale reading.
Open input produces zero reading.
Time to Detect Open Circuit
10s maximum
Calibration
AutoĆcalibration (offset and gain)
Zero offset and gain adjustment for each channel via
programming terminal
Verify every six months to maintain specified accuracy
Engineering units sent to
processor
+9999 BCD with selectable scaling
+32767 binary
Internal scan rate
50ms for 8 channels
Backplane Current
1.1A @ +5V
Power Dissipation
5.5 Watts maximum
Thermal Dissipation
18.8 BTU/hr maximum
Conductors
Wiring
Category
Cable
14 gauge stranded (max.)
3/64 inch insulation (max.)
Category 2
1
Use Bellden 8761 shielded cable
Specifications continued on next page
Specifications