Product Overview
The Allen-Bradley 1794-OF4I is a Flex I/O isolated analog output module from Rockwell Automation. Designed for precise signal conversion, this module provides four isolated analog output channels that deliver current signals (4-20 mA, 0-20 mA) and voltage signals (±10VDC, 0-10VDC, ±5VDC, 0-5VDC). Its robust construction and isolation ensure reliable performance in industrial environments, making it a trusted choice for maintenance engineers seeking dependable control.
Technical Specifications Breakdown
Key parameters for the 1794-OF4I are listed below for quick reference:
| Feature | Specification |
|---|---|
| Output Type | 4-20 mA, 0-20 mA, ±10VDC, 0-10VDC, ±5VDC, 0-5VDC |
| Number of Channels | 4 Isolated |
| Resolution | 15 bits plus sign |
| Update Rate | 2.5/5.0 ms all channels |
| Step Response (63% full scale) | < 25 µs |
| External DC Supply Range | 19.2…31.2V DC (includes 5% AC ripple) |
| FlexBus Current | 50 mA |
| Isolation Voltage | 120V Continuous |
| Operating Temperature | 0 to 55 °C (32 to 131 °F) |
| Storage Temperature | –40…85 °C (–40…185 °F) |
| Vibration | 5g @ 10 to 500 Hz |
| Operating Shock | 30 g |
Industry Applications
In process industries, the 1794-OF4I ensures signal integrity by isolating output channels, reducing ground loop issues. For maintenance teams, its user-configurable output ranges simplify setup across different machines, minimizing downtime during changeovers.
Installation & Setup Guidance
Mount the 1794-OF4I on a DIN rail using compatible terminal bases (1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, 1794-TBN). Connect the external DC supply within the 19.2…31.2V DC range, including 5% AC ripple. Ensure the FlexBus current does not exceed 50 mA. Configure output types via software before operation; both voltage and current terminals output 0 until configured. Always verify isolation voltage (120V continuous) per terminal base used.
Maintenance & Reliability
To maintain reliability, inspect the module periodically for dust or moisture in the enclosure. The 1794-OF4I operates reliably from 0 to 55 °C and withstands 5g vibration at 10 to 500 Hz. Its 30 g shock rating ensures resilience in harsh environments. For long-term stability, avoid exceeding the thermal dissipation of 16 BTU/hr at 31.2V DC max.
Compatibility & Integration
It uses a FlexBus voltage of 5V DC and draws 50 mA from the backplane. The 1794-OF4I is compatible with Rockwell Automation control systems, supporting digital-to-analog conversion with 15-bit plus sign resolution.
Selection Guide & Purchasing Advice
When selecting the 1794-OF4I, consider your output signal requirements (current or voltage) and isolation needs. For current lifecycle status and availability, contact AutoDCSTech before ordering. AutoDCSTech offers genuine Allen-Bradley parts with expert support for industrial automation needs.
Troubleshooting & Common Issues
If outputs remain at zero, verify module configuration and external DC supply within 19.2…31.2V DC. Check for overload conditions (max 30V or 32 mA continuous per channel). For accuracy drift, note the voltage terminal drift is 0.0012% full scale/°C and current terminal drift is 0.0025% full scale/°C. Factory calibration is standard; manual recalibration is optional if needed.
Availability & Condition at AutoDCSTech
| Part Number | 1794-OF4I |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
