The Allen-Bradley 1794-OF4I is a 4-channel isolated analog output module for the FLEX I/O system. The module supports Removal and Insertion Under Power (RIUP) for hot-swap maintenance and includes open-wire detection and field power monitoring diagnostics.
Item No :
1794-OF4IOrder(MOQ) :
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EXWProduct Origin :
Singapore/ChinaShipping Port :
WuhanLead Time :
3~5 daysWeight :
5kg| Specification | Description |
|---|---|
| Manufacturer | Rockwell Automation (Allen-Bradley) |
| Model | 1794-OF4I |
| Product Family | FLEX I/O (1794 Series) |
| Product Type | Isolated Analog Output Module |
| Output Channels | 4 isolated (channel-to-channel isolation) |
| Output Signal Ranges | Current: 0–20 mA, 4–20 mA; Voltage: ±10V, 0–10V, ±5V, 0–5V (software configurable) |
| Resolution | 15 bits plus sign (16-bit signed) |
| Accuracy | ±0.1% full scale @ 25°C |
| Temperature Drift | ±0.0025%/°C typical |
| Update Rate | 2.5 ms or 5.0 ms all channels |
| Isolation Voltage | 120V continuous (with standard terminal bases); 250V continuous (with 1794-TBN) |
| External DC Supply | 24V DC nominal (19.2–31.2V DC range, including 5% AC ripple) |
| FlexBus Current | 50 mA @ 5V DC |
| Power Dissipation | 4.6 W max |
| Thermal Dissipation | 16 BTU/hr @ 31.2V DC max |
| Terminal Bases | 1794-TB2, -TB3, -TB3S, -TB3T, -TB3TS, -TBN |
| Operating Temperature | 0°C to +55°C |
| Storage Temperature | -40°C to +85°C |
| Dimensions (H x W x D) | Approx. 120 x 22 x 87 mm |
| Weight | Approx. 0.40 kg (0.88 lbs) |
| Hot Swap (RIUP) | Supported |
| Certifications | CE, CSA, UL, ATEX, IECEx, Marine (ABS, RINA) |
| Lifecycle Status | Active Mature / Available |
| Model | Description | Typical Application |
|---|---|---|
| 1794-OF4I (this model) | 4-ch isolated analog output, current/voltage | Precision actuator control with isolation |
| 1794-OE4 | 4-ch analog output, non-isolated | Standard analog output applications |
| 1794-OE8H | 8-ch HART analog output (discontinued) | HART valve positioner control |
| 1794-OF8IH | 8-ch isolated HART analog output | HART + isolation applications |
| 1794-IE8 | 8-ch analog input, non-isolated | Analog input companion module |
| 1794-IF8IH | 8-ch isolated HART analog input | HART input with channel isolation |
| 5094-OF8 | FLEX 5000 8-ch analog output | Recommended migration path |
| 1794-TB3 | Terminal base for 1794-OF4I | Required mounting base |
Q1: What is the primary function of the 1794-OF4I?
It is a 4-channel isolated analog output module for the FLEX I/O system. It converts digital values from the PLC into precise analog current or voltage signals to control field actuators such as variable frequency drives, control valves, and servo drives. The channel-to-channel isolation eliminates ground loops and common-mode interference, making it suitable for electrically noisy industrial environments.
Q2: What signal ranges does the 1794-OF4I support?
Each channel can be independently configured via software for current output (0–20 mA or 4–20 mA) or voltage output (±10V, 0–10V, ±5V, or 0–5V). This flexibility allows a single module to interface with a wide variety of field devices, reducing spare parts inventory.
Q3: Does the 1794-OF4I support hot-swap?
Yes. The module supports Removal and Insertion Under Power (RIUP), allowing replacement while the system is running. This minimizes maintenance downtime in continuous process applications. The module's configuration is stored in the controller, and output values are held during the swap according to the configured safe-state behavior.
Q4: What diagnostics does the 1794-OF4I provide?
The module includes open-wire detection for current outputs (Ch0OpenWire through Ch3OpenWire status bits) and field power monitoring (FieldPowerOff bit). These diagnostics help identify wiring faults and power supply issues without external test equipment.
Q5: Is the 1794-OF4I still available?
Yes, the module is listed as Active Mature by Rockwell Automation, meaning it remains fully supported. However, Rockwell recommends migrating to the FLEX 5000 platform (5094-OF8) for new installations. Existing 1794 FLEX I/O installations remain supported, and the 1794-OF4I continues to be available through authorized distributors.
The Allen-Bradley 1794-OE4 is a 4-channel analog output module for the FLEX I/O system. It provides 4 single-ended, non-isolated outputs with software-selectable voltage (±10V, 0–10V) or current (0–20 mA, 4–20 mA) ranges, offering 12-bit plus sign resolution and 1.024 ms conversion rate for all channels.
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The Allen-Bradley 1794-OF4I is a 4-channel isolated analog output module for the FLEX I/O system. The module supports Removal and Insertion Under Power (RIUP) for hot-swap maintenance and includes open-wire detection and field power monitoring diagnostics.
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