Rated 4.2 with 11 reviews

1794-OF4I

Revisions: Ser A

Description:   The Allen-Bradley 1794-OF4I Flex I/O Isolated Output Analog Module has 4 Isolated Outputs, a 15 bits Resolution, and a Digital-to-Analog Converter Conversion Type. It also operates with a 3mA max. Current Load on Voltage Output and a 50mA FlexBus Current.

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About 1794-OF4I

The Allen-Bradley 1794-OF4I is a 24 Volts DC FLEX I/O analog module. It has 4 isolated outputs and 4 key switch positions. These outputs can be connected to devices that use category 2-, 3-, or 4- wires. This module is compatible with several terminal base units, namely the 1794-TBT, 1794-TB3, 1794-TB3TS, 1794-TB3S, 1794-TBNF, and the 1794-TBN. It can be mounted using a DIN rail or a panel, it has an open enclosure, and it measures 3.7 x 2.6 x 3.7 inches

The external DC voltage range of the 1794-OF4I module is 19.2 to 31.2 Volts DC, including the 5% AC ripple. It also has an external DC power supply current of 210 mA at 24 Volts DC. Its maximum overload is 30 Volts or 32 mA continuous in one channel at a time. This module has a maximum 3 mA current load on voltage output and a 0 to 750 Ω resistive load on voltage output. Its output current ranges are 4 to 20 mA and 0 to 20 mA. Both of these ranges are user-configurable. The module's output voltage varies from +/-10 Volts, +/-5 Volts, 0 to 10 Volts, and 0 to 5 Volts, all of which are also user-configurable. Both the voltage and current terminals have 0 output until the module is configured. The 1794-OF4I has a maximum power dissipation of 4.7 W at 31.2 Volts DC and a maximum thermal dissipation of 16 BTU/hour at 31.2 Volts DC. The module's isolation voltage is dependent on the terminal base unit it is connected to; it is 250 Volts continuous when using a 1794-TBN base unit and 120 Volts continuous when using other compatible base units.

The FlexBus voltage of the module is 5 Volts DC, while the FlexBus current is 50 mA. It has a resolution of 15 bits + sign, 0.320 mV/cnt (voltage), and 0.656 mA/cnt (current). It also has an update rate of 2.5 or 5 milliseconds for all channels and a <25 µs step response at 63% of full scale. Both the voltage and current terminals have an absolute accuracy of 0.1% full scale at 25 degrees Celsius but they have different accuracy drifts with temperature, since it is 0.0012% full scale per degree Celsius for the voltage terminal and 0.0025% full scale per degree Celsius for the current terminal. The conversion type for the 1794-OF4I is digital-to-analog.

Technical specifications:

Part Number:1794-OF4I
Product Type:Flex I/O Isolated Output Analog Module
Outputs:4 Isolated
Resolution:15 bits
Conversion Type:Digital-to-Analog Converter
Update Rate:2.5/5.0 ms
Current Load on Voltage Output:3mA max.
FlexBus Current:50mA
Isolation Voltage:120V Continuous
Output Current Terminal:4-20mA
Output Voltage Terminal: +/- 10V
Thermal Dissipation:16 BTU/hr. @ 31.2V DC max.

FAQ

Question: What is the data format used with the 1794-OF4I Isolated Output Analog Module?

Answer: The 1794-OF4I Isolated Output Analog Module uses four data formats: binary, offset binary, 2's complement, 2's complement percent. 

 

Question: When the 1794-OF4I Isolated Output Analog Module is processing data, what is the conversion type?

Answer: The 1794-OF4I Isolated Output Analog Module uses a digital-to-analog converter. 

 

Question: What are the output current and voltage rates for the 1794-OF4I Isolated Output Analog Module?

Answer: The output current and voltage rates are user configurable on the 1794-OF4I Isolated Output Analog Module. Until the rates have been configured, no output will occur. 

 

Question: What are module locations that the 1794-OF4I Isolated Output Analog Module is compatible with?

Answer: The 1794-OF4I Isolated Output Analog Module is compatible with 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, or 1794-TBN.

 

Question: Is the 1794-OF4I Isolated Output Analog Module calibrated?

Answer: Yes, the 1794-OF4I Isolated Output Analog Module is factory calibrated but can be recalibrated when necessary. 

 

Question: What is the price of the 1794-OF4I Isolated Output Analog Module?

Answer: Submit a quote request, send us an email, or call 800-730-0292 for our best price.

 

Question: Where can I find repair services for the 1794-OF4I Isolated Output Analog Module?

Answer: DO Supply offers repair services for the 1794-OF4I Isolated Output Analog Module. For more information or to request a repair quote, please click here

Please refer to the manual for more information about the 1794-OF4I such as the wiring diagrams, data sheets, firmware information and migration or obsolescence details.

Revision Part # Also Known as Availability
1794-OF4I Ser A
1794-OF4I/A, Series A, Rev A Request Quote

Common misspellings: 1794OF4I
l794-OF4I
179A-OF4I
1794-0F4I
1794-OFAI
1794-OF4IX