Allen-Bradley 1794-OE12 12-Channel Analog Output Module

Product Introduction

The Allen-Bradley 1794-OE12 significantly expands the analog control capabilities of the Flex I/O system. This high-density module features twelve single-ended analog output channels in a compact form factor. Users can configure each channel independently for 4-20 mA, 0-20 mA current loops, or ±10V DC voltage signals. The 1794-OE12 delivers exceptional accuracy and resolution, making it ideal for precision control applications like valve positioning and variable speed drives. Its design ensures seamless integration with any 1794 Flex I/O adapter, simplifying system architecture.

Technical Specifications

The 1794-OE12 utilizes a 16-bit digital-to-analog converter (DAC) for precise signal generation. The data format is 2’s complement and left justified. For voltage outputs, the range is ±10V DC with a resolution of 320 μV/cnt. For current outputs, the module supports both 0-20mA and 4-20mA signals, providing a fine resolution of 0.641 μA/cnt.

Regarding output drive capabilities, the voltage output can source up to 3mA maximum. The current output can drive a resistive load of 0 to 750Ω when operating at 24V DC. The module's absolute accuracy is rated at 0.1% of full scale at 25 °C for both voltage and current outputs. Furthermore, the accuracy drift is a minimal 0.004% of full scale per degree Celsius, ensuring stable performance across varying temperatures.

Mechanical and Environmental Parameters

The 1794-OE12 features an open-type enclosure and must be installed within a protected industrial cabinet. Its physical dimensions are 94.0 x 94.0 x 53.3 mm (3.7 x 3.7 x 2.1 inches). For environmental resilience, it supports a wide operating temperature range from -20 to 60 °C. The storage temperature range is from -40 to 85 °C. Additionally, the module tolerates a relative humidity of 5 to 95% non-condensing and is tested for vibration at 5g @ 10-500 Hz and operating shock at 30g.

Installation and Wiring Guide

Installing the 1794-OE12 requires a compatible terminal base unit. The recommended bases are the Cat. No. 1794-TB3G or 1794-TB3GS. Before mounting, ensure the keyswitch on the base is set to Position 4. This configuration is critical for the adapter to recognize the 1794-OE12 correctly.

First, mount the selected terminal base securely onto a standard DIN rail. Next, align the 1794-OE12 module with the base and press it firmly until the latches click into place. The external DC power supply must be within the 10.0 to 31.2V DC range, with a nominal voltage of 24V DC. Finally, connect the field device wiring to the appropriate terminals on the base. The module will output 0 mA until it receives a valid configuration from the network adapter.

Packaging and Shipping

Your Allen-Bradley 1794-OE12 module will arrive in secure packaging suitable for industrial components. The shipment includes the analog output module only. Please note that the terminal base unit, wiring, and any mounting hardware are sold separately. We partner with leading global carriers for all shipments, exclusively using Fedex, UPS, and DHL to guarantee prompt and safe delivery.

Frequently Asked Questions (FAQ)

1. What types of signals does the 1794-OE12 support?
The Allen-Bradley 1794-OE12 supports configurable outputs for 0-20 mA, 4-20 mA current signals, and ±10V DC voltage signals.

2. Which terminal base is compatible with this module?
The 1794-OE12 is compatible with the 1794-TB3G and 1794-TB3GS terminal base units.

3. What is the required keyswitch position for the 1794-OE12?
The keyswitch on the terminal base must be set to Position 4 for the 1794-OE12 to function correctly.

4. Does this module require calibration after installation?
No, the 1794-OE12 does not require manual calibration, which simplifies maintenance and setup.

5. What is the resolution of the analog outputs?
The module features a 16-bit resolution, providing 320 μV/cnt for voltage and 0.641 μA/cnt for current outputs.