Rockwell Automation Publication 1794-IN049E-EN-P - May 2022
11
FLEX I/O 2-input Frequency Modules Installation Instructions
General Specifications
Attribute
Value
Module location
1794-TB3G and 1794-TB3GS Terminal Base Units
External DC power
Voltage range
Supply voltage, nom
Supply current
(Input for +5V logic and 24V DC/DC converters)
19.2…31.2V DC (includes 5% AC ripple)
24V DC
220 mA @ 19.2V DC; 180 mA @ 24V DC; 140 mA @ 31.2V DC
Isolated DC power
Voltage range
Supply voltage, nom
Supply current, max
Peak AC ripple, max
(Output to sensors and encoders)
21.6…26.4V DC
24V DC
0…60 mA @ 24V DC (4 devices @ 15 mA = 60 mA)
100 mV
Dimensions (with module installed in base),
(H x W x D)
94 x 94 x 69 mm (3.7 x 3.7 x 2.7 in.)
Isolation voltage
50V (continuous), Basic Insulation Type
Type tested at 1365V AC for 60 s, between field side and system and individual channels
Processing time
< 4 ms
Flexbus current
30 mA at 5V DC
Power dissipation, max
4.6 W at 31.2V DC
Thermal dissipation, max
15.6 BTU/hr at 31.2V DC
Indicators (field side driven, logic side indication)
1 green/red power/status indicator
4 yellow status indicators (Freq 0, 1, Gate 0, 1)
4 red wire-off indicators (Freq 0, 1, Gate 0, 1)
2 yellow status indicators (Out 0, Out 1) - logic side
Keyswitch Position
1
Wire size
Determined by installed terminal base
Wiring category
(1)
2 - on signal ports
3 - on power ports
Wire type
Shielded on signal ports
Terminal screw torque
Determined by installed terminal base
Enclosure type rating
None (open-style)
North American temp code
T4A
IECEx temp code
T4
ATEX temp code
T4
(1) Use this conductor category information for planning conductor routing. See the Industrial Automation Wiring and Grounding Guidelines, publication
Environmental Specifications
Attribute
Value
Temperature, operating
IEC 60068-2-1 (Test Ad, Operating Cold),
IEC 60068-2-2 (Test Bd, Operating Dry Heat),
IEC 60068-2-14 (Test Nb, Operating Thermal Shock):
0…55 °C (32…131 °F) (1794-IJ2)
-20…+70 °C (-4…+158 °F) (1794-IJ2XT)
Temperature, surrounding air, max
55 °C (131 °F) (1794-IJ2)
70 °C (158 °F) (1794-IJXT)
Temperature, nonoperating
IEC 60068-2-1 (Test Ab, Unpackaged nonoperating Cold),
IEC 60068-2-2 (Test Bb, Unpackaged nonoperating Dry Heat),
IEC 60068-2-14 (Test Na, Unpackaged nonoperating Thermal Shock):
-40…+85 °C (-40…+185 °F)
Relative humidity
IEC 60068-2-30 (Test Db, Unpackaged Damp Heat):
5…95% noncondensing
Vibration
IEC 60068-2-6 (Test Fc, Operating):
5 g @ 10…500 Hz
Shock, operating
IEC 60068-2-27 (Test Ea, Unpackaged Shock):
30 g
Shock, nonoperating
IEC 60068-2-27 (Test Ea, Unpackaged Shock):
50 g
Emissions
IEC 61000-6-4
