Description
Description: The Allen-Bradley 1794-OF4I is a Flex IO isolated analog output module. This module has Four (4) isolated analog output channels. It provides output current signals such as 4-20 mA, 0-20 mA and Voltage signals such as ±10VDC; 0-10VDC; +/- 5VDC and 0-5VDC. It is compatible for use with Flex I/O terminal bases such as 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, 1794-TBN. It is compatible with any 1794 Flex IO adapters to implement distributed I/O application.
Technical Specifications for 1794-OF4I
| Manufacturer | Rockwell Automation |
| Operating Temperature: | 0 to 55 C (32 to 131 F) |
| Mounting: | DIN Rail |
| External DC supply range: | 19.2…31.2V DC (includes 5% AC ripple) |
| External DC supply, nom: | 24V DC |
| Terminal base: | 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794- TB3TS, 1794-TBN |
| Step response to 63% of full scale | < 25 s |
| Current resolution | 0.656 mA/cnt |
| Voltage Resolution | 0.320 mV/cnt |
| Output type: | 4-20 mA, 0-20 mA and ±10VDC; 0-10VDC; +/- 5VDC and 0-5VDC |
| No. of outputs: | Four (4) Isolated |
| Product Description: | Flex IO High Output Module |
| Storage Temperature: | –40…85 °C (–40…185 °F) |
| Brand | Allen-Bradley |
| Vibration: | 5g @ 10 to 500 Hz |
| Part Number/Catalog No. | 1794-OF4I |
| Resolution | 15 bits plus sign |
| Conversion Type | Digital to Analog Converter |
| Update Rate | 2.5/5.0 ms all channels |
| Operating Shock: | 30 g |
| Product Type | Flex I/O Isolated Output Analog Module |
| Outputs | 4 Isolated |
| 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. |
The Allen-Bradley 1794-OF4I is a FLEX I/O analog module. It has 4 isolated analog outputs that 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 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 has an isolation rating of 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. 
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