The Allen-Bradley 1794-OE4 is a high-density Flex I/O analog output module. This unit delivers precise control signals for industrial automation systems. Engineers use this module to command final control elements like VFDs and valves.
Expert Technical Evaluation & Performance Review
The 1794-OE4 uses pulse width modulation for output conversion. Its conversion rate reaches 1.024 milliseconds for all four channels. This speed ensures responsive control of modulating devices in your process.
The module’s current output accuracy is 0.425% full scale at 25°C. Its voltage output accuracy is 0.133% full scale at the same temperature. These values guarantee high precision for demanding analog control loops.
Temperature drift remains minimal for both output types. Current drift measures 0.0069% full scale per °C. Voltage drift measures 0.0045% full scale per °C. This stability maintains signal integrity across varying thermal conditions.
Each channel supports four output signal ranges. You can select 0 to 20 mA or 4 to 20 mA for current loops. For voltage control, choose +/-10 Volts or 0 to 10 Volts. This flexibility covers most industrial actuator requirements.
The module provides a 12-bit plus sign resolution. Voltage increments are 2.56 mV per count. Current increments are 5.13 µA per count. This granularity enables fine adjustments for precise process control.
The step response time is 24 milliseconds for voltage outputs. This rating applies to 63% of the full-scale setting. The response ensures fast reaction to controller commands for critical applications.
Product Procurement & Buyer Guide
This module requires an external DC supply of 24 Volts nominal. It draws 70 mA from the supply rail. The acceptable supply range spans from 10.0 to 31.2 Volts DC, including ripple.
The 1794-OE4 dissipates a maximum of 4.5 Watts at 31.2 Volts DC. Its thermal dissipation reaches 15.3 BTU per hour under the same conditions. These values help you plan enclosure cooling requirements.
The module operates reliably from 0 to 55 degrees Celsius. It withstands storage temperatures from -40 to 85 degrees Celsius. The unit also handles 5g vibration from 10 to 500 Hz. This ruggedness suits harsh industrial environments.
You need one compatible terminal base for installation. Options include the 1794-TB2, -TB3, -TB3S, -TB3T, -TB3TS, and -TBN models. These bases provide DIN rail mounting and signal wiring points.
The module’s voltage output supports a 3 mA maximum current load. Its current output drives resistive loads from 15 to 750 Ohms. These ratings ensure compatibility with common field devices.
The unit has a 20 mA Flexbus current rating. It provides 50 Volts of continuous isolation between I/O and the system. This isolation protects your control system from ground loops.
A single green/red LED indicates power and status. The module requires no field calibration. This feature reduces maintenance time and simplifies initial setup.
Logistics & Standard Packaging Details
- One Allen-Bradley 1794-OE4 Flex I/O Analog Output Module
- Product ships in anti-static protective packaging
- Each unit includes a unique serial number for traceability
- We ship all orders via express delivery services
- Available carriers include FedEx, UPS, and DHL for fast transit
