Specifications – Rockwell Automation 1771-IL INSTL.INSTR.ISOL ANALOG INPUT User Manual

Page 13

Isolated Analog Input Module

Publication 1771Ć5.51 - October 1996

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

Maximum Ć 0.05% of full scale range @ 25

Typical Ć 0.06% of full scale range @ 25

Maximum Ć 0.1% of full scale range @ 25

(Includes 0.05% when using internal current resistor)

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

for unipolar ranges

(0 to 5V, +1 to +5V, 0 to +20mA, and +4 to +20mA)

Ć4095

to 4095

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