Product Summary
The Allen-Bradley 1794-OF4I provides four isolated analog output channels for precise control. This module delivers both voltage and current signals with high accuracy. The module achieves an absolute accuracy of 0.1% full scale at 25 °C. It also features a fast step response of less than 25 µs. Engineers rely on this module for demanding automation tasks.
Expert Technical Evaluation & Performance Review
Signal Accuracy and Drift Characteristics
The 1794-OF4I delivers exceptional signal integrity for critical processes. Its voltage terminal offers an accuracy drift of just 0.0012% full scale per °C. The current terminal maintains a drift of 0.0025% full scale per °C. This stability ensures reliable performance across varying temperatures. The module operates within a range of 0 to 55 °C. This makes it suitable for most industrial environments.
Resolution and Conversion Capabilities
This module uses a 15-bit plus sign digital-to-analog converter. It provides a voltage resolution of 0.320 mV per count. The current resolution reaches 0.656 µA per count. You can configure the update rate to 2.5 or 5.0 milliseconds. This speed allows the module to respond quickly to control commands. The fast step response of <25 µs enhances system reaction times.
Output Flexibility and Channel Isolation
The module supports multiple output types for versatile use. It handles current signals from 4 to 20 mA and 0 to 20 mA. It also outputs voltage signals of ±10V, 0-10V, ±5V, and 0-5V. Each of the four channels is fully isolated. This isolation prevents ground loops and protects your system. The maximum current load on voltage output is 3 mA.
Power Supply and Electrical Requirements
The 1794-OF4I requires a 24VDC external power supply. The acceptable voltage range spans from 19.2 to 31.2 VDC. This range includes a 5% AC ripple allowance. The module draws a FlexBus current of 50 mA at 5VDC. Its maximum power dissipation is 4.7 W at 31.2 VDC. The thermal dissipation reaches 16 BTU per hour at maximum load.
Installation and Environmental Tolerances
You can mount this module on a DIN rail or a sub-panel. It is compatible with terminal bases like 1794-TB2 and 1794-TBN. The module withstands 5g vibration from 10 to 500 Hz. It also handles an operating shock of 30 g. This ruggedness ensures reliable operation in harsh conditions. The module is approved for use in hazardous locations.
Overload Protection and Calibration
The module offers robust overload protection for your system. It handles 30V continuous or 32 mA continuous on one channel. This protection prevents damage from accidental overcurrent conditions. The unit comes factory calibrated for immediate use. You also have the option to perform manual calibration. This flexibility helps maintain long-term accuracy in the field.
Logistics & Standard Packaging Details
- One Allen-Bradley 1794-OF4I Flex I/O isolated analog output module
- Quick start installation guide
- Product documentation and compliance sheet
- No terminal base unit is included in the package
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