Technical data

Publication 1794-2.1 - January 2000
110 24V dc Source Isolated Analog 4 Input Module Cat. No. 1794-IF4I FLEX I/O and FLEX Integra Product Data
Specifications - 1794-IF4I
Number of Inputs 4 isolated
Module Location Cat. No. 1794-TB3, -TB3S, -TB2, -TB3T, -TB3TS,
and -TBN Terminal Base Units
Input Current Terminal 4-20mA (user configurable)
0-20mA (user configurable)
±20mA (user configurable)
Input Voltage Terminal ±10V (user configurable)
0-10V (user configurable)
±5V (user configurable)
0-5V (user configurable)
Resolution
Voltage
Current
16 bits - unipolar; 15 bits plus sign - bipolar
0.156mV/cnt unipolar; 0.313mV/cnt bipolar
0.320µA/cnt unipolar; 0.640 µA/cnt bipolar
Input Resistance
Voltage Terminal
Current Terminal
>10 megohm
<100Ω
1
Isolation Voltage 120V ac continuous (when used with -TB3, -TB3S,
-TB2, -TB3T, and -TB3TS)
250V ac continuous (when used with -TBN)
Module is factory tested to 2550V dc for 1s
between: channel to channel
channel to user power
channel to system
user power to system
Flexbus Current 50mA
Power Dissipation 2.0W maximum @ 31.2V dc
Thermal Dissipation Maximum 6.9 BTU/hr @ 31.2V dc
Indicators 1 green power/status indicator
Keyswitch Position 3
Data Format 2’s complement
2’s complement percent
binary
offset binary
Conversion Type Sigma Delta
Update Rate 2.5/5.0/7.5ms all channels
Normal Mode
Rejection Ratio
Voltage or
Current Terminal
-3dB @ 12Hz (300Hz conversion rate)
-80.0dB @ 50Hz (300Hz conversion rate)
-3dB @ 6Hz (150Hz conversion rate)
-80.0dB @ 60Hz (150Hz conversion rate)
Common Mode Rejection
Ratio
-120dB @ 50/60Hz
Calibration Factory calibrated
Step Response to 63%
Voltage or
Current Terminal
1200Hz conversion rate = 0.6ms
600Hz conversion rate = 6.7ms
300Hz conversion rate = 13.4ms
150Hz conversion rate = 26.7ms
Absolute Accuracy
2
Voltage Terminal
Current Terminal
0.1% Full Scale @ 25
o
C
0.1% Full Scale @ 25
o
C
Accuracy Drift w/Temp.
Voltage Terminal
Current Terminal
0.0028% Full Scale/
o
C
0.0038% Full Scale/
o
C
Maximum Overload 30V continuous or 32mA continuous, one
channel at a time
General Specifications
External dc Power
Supply Voltage
Voltage Range
Supply Current
24V dc nominal
19.2 to 31.2V dc (includes 5% ac ripple)
80mA @ 24V dc
Dimensions HxWxD 46mm x 94mm x 53mm (1.8in x 3.7in x 2.1in)
Environmental Conditions
Operational Temperature
Storage Temperature
Relative Humidity
Shock Operating
Non-operating
Vibration
0 to 55
o
C (32 to 131
o
F)
-40 to 85
o
C (-40 to 185
o
F)
5 to 95% noncondensing (operating)
5 to 80% noncondensing (non-operating)
30g peak acceleration, 11(±1)ms pulse width
50g peak acceleration, 11(±1)ms pulse width
Tested 5g @ 10-500Hz per IEC 68-2-6
ConductorsWire Size
Category
12 gauge (4mm
2
) stranded maximum
3/64 inch (1.2mm) insulation maximum
2
3
Publications
Installation Instructions
User Manual
1794-5.38
1794-6.5.8
Agency Certification
1 If 24V dc is removed from the module, input resistance = 10kΩ.
2 Includes offset, gain, non-linearity and repeatability error terms.
3 Use this conductor category information for planning conductor routing. Refer to
publication 1770-4.1, “Industrial Automation Wiring and Grounding Guidelines for Noise
Immunity.”
Class I Division 2 certified
Groups A, B, C, D certified
Class I Zone 2 Group IIC certified