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.
Item No :
1794-OE4Order(MOQ) :
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EXWProduct Origin :
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WuhanLead Time :
3~5 daysWeight :
5kg| Specification | Description |
|---|---|
| Manufacturer | Rockwell Automation (Allen-Bradley) |
| Model | 1794-OE4 |
| Product Family | FLEX I/O (1794 Series) |
| Product Type | Analog Output Module |
| Number of Outputs | 4 single-ended, non-isolated |
| Output Signal Ranges | Voltage: ±10V, 0–10V; Current: 0–20 mA, 4–20 mA (software selectable per channel) |
| Resolution | 12 bits plus sign |
| Conversion Type | Pulse Width Modulation (PWM) |
| Conversion Rate | 1.024 ms for all channels |
| Accuracy (25°C) | Voltage: 0.133% full scale; Current: 0.425% full scale |
| Accuracy Drift | Voltage: 0.0045% FS/°C; Current: 0.0069% FS/°C |
| Step Response (63%) | 24 ms (voltage) |
| Current Load (Voltage Output) | 3 mA max |
| Resistive Load (Current Output) | 15–750 Ω |
| Isolation Voltage | 850 V DC for 1 s (user to system); no channel-to-channel isolation |
| External DC Power | 24V DC nominal (19.2–31.2V DC) |
| FlexBus Current | 20 mA |
| Power Dissipation | 4.5 W max @ 31.2V DC |
| Keyswitch Position | 4 |
| Indicators | 1 green power indicator |
| Terminal Bases | 1794-TB2, -TB3, -TB3S, -TB3T, -TB3TS, -TBN |
| Operating Temperature | 0°C to +55°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5–95% non-condensing (operating) |
| Dimensions (H x W x D) | 45.7 x 94.0 x 53.3 mm (1.8 x 3.7 x 2.1 in.) |
| Weight | Approx. 0.5 kg |
| Country of Origin | Singapore |
| Certifications | CE, CSA, UL, C-Tick, GOST, KC, Marine |
| Lifecycle Status | End of Life (Discontinued February 28, 2027) |
| Model | Description | Typical Application |
|---|---|---|
| 1794-OE4 (this model) | 4-ch analog output, selectable voltage/current, non-isolated | Standard analog output control (End of Life) |
| 1794-OE4XT | Extended temperature version (-20 to +70°C), conformal coated | Harsh environments requiring wide temperature |
| 1794-OE4K | Conformal-coated version | Corrosive or humid environments |
| 1794-OE8H | 8-ch HART analog output (discontinued) | HART valve positioner control |
| 1794-OF4I | 4-ch isolated analog output | Applications requiring channel isolation |
| 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 | Recommended replacement — FLEX 5000 8-ch analog output | Migration path for discontinued 1794-OE4 |
| 1794-TB3 | Terminal base for 1794-OE4 | Required mounting base (recommended) |
Q1: What is the primary function of the 1794-OE4?
It is a 4-channel analog output module for the FLEX I/O system. It converts digital values from the PLC into precise analog voltage or current signals to control field actuators such as variable frequency drives, control valves, and positioners. It supports both voltage and current output ranges, selectable per channel via software configuration.
Q2: Does the 1794-OE4 provide channel-to-channel isolation?
No. The 1794-OE4 provides 4 single-ended, non-isolated outputs. There is no isolation between individual channels. The module does provide 850V DC isolation between the field wiring and the system side (user to system) for 1 second. For applications requiring channel-to-channel isolation, consider the 1794-OF4I or 1794-OF8IH modules.
Q3: What output signal ranges does the 1794-OE4 support?
Each channel can be independently configured via software for:
Voltage: ±10V or 0–10V
Current: 0–20 mA or 4–20 mA
The default configuration is 4–20 mA. The output terminals remain at 0 mA or 0V until the module is properly configured by the controller.
Q4: What terminal bases and communication adapters are compatible with the 1794-OE4?
The module is compatible with terminal bases 1794-TB2, -TB3, -TB3S, -TB3T, -TB3TS, and -TBN. The 1794-TB3 is the recommended base. For communication, it works with FLEX I/O adapters including 1794-AENT(R) (EtherNet/IP), 1794-ACN(R)15 (ControlNet), 1794-AND (DeviceNet), 1794-ASB (Remote I/O), and 1794-APB (PROFIBUS).
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.
The Allen-Bradley 1794-IRT8 is an 8-channel thermocouple, RTD, and millivolt input module for the FLEX I/O system. The module features 14-bit input resolution, wire-off/overrange/underrange detection, and cold-junction compensation via external compensators (1794-CJC2) for thermocouple accuracy.
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.
The Allen-Bradley 1794-IF8IH is an 8-channel isolated HART analog input module for the FLEX I/O system. It provides 8 individually isolated current inputs (0–20 mA or 4–20 mA) with 16-bit resolution and HART 5/6/7 pass-through communication, enabling remote configuration, calibration, and diagnostics of HART-enabled transmitters without additional multiplexers.
The Allen-Bradley 1794-OE8H is an 8-channel HART analog output module for the FLEX I/O system, designed for process control applications requiring direct communication with smart field devices. It provides 0–20 mA or 4–20 mA current outputs on each channel while simultaneously enabling HART digital communication over the same two wires, eliminating the need for external HART multiplexers or additional wiring.
The Allen-Bradley 1794-IT8 is an 8-channel thermocouple/millivolt input module for the FLEX I/O system, designed for direct interfacing with a wide variety of thermocouple sensors and low-level millivolt sources. The module includes cold-junction compensation and on-board scaling, simplifying programming and eliminating the need to scale data in the user program.
The Allen-Bradley 2711P-RDB10C is a PanelView Plus 1000 series display module designed as a replacement or spare for PanelView Plus and PanelView Plus 6 1000 operator terminals. It features a 10.4-inch color TFT display with 640 x 480 pixel resolution, a keypad and analog resistive touchscreen for operator input, and a CCFL backlight rated for 50,000 hours.
The Allen-Bradley 2711P-T15C4D9 is a PanelView Plus 6 1500 operator terminal featuring a 15.0-inch color active-matrix TFT touchscreen with 1024 x 768 resolution and 18-bit color graphics. It includes 512 MB Flash memory and 512 MB RAM, along with embedded Ethernet, RS-232, and two USB host ports for flexible connectivity.
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