Allen Bradley 1794-OE12

Brand: Allen Bradley
Model: 1794-OE12

Inventory situation: Goods are available in stock.

Product features

The Allen Bradley 1794-OE12 is a Flex I/O high-density analog output module from Rockwell Automation, designed to deliver precise control signals to industrial actuators and devices in manufacturing and process automation systems. This module provides 12 single-ended, non-isolated configurable output channels that convert digital controller signals into accurate analog outputs, making it ideal for applications requiring reliable and consistent control.

The 1794-OE12 features 12 independent output channels that can be individually configured for either current (4-20mA or 0-20mA) or voltage (±10VDC) signals, giving system integrators maximum flexibility for diverse field equipment requirements. Each channel uses a 16-bit binary complement data format for high-resolution control, with a voltage resolution of 320 microvolts per count and a current resolution of 0.641 microamps per count.

This module delivers exceptional accuracy with 0.1% full scale precision at 25°C for both voltage and current outputs, and maintains stability with a low temperature drift rate of 0.004% full scale per °C. Factory calibration eliminates manual adjustments, ensuring consistent performance without potentiometer tuning. The 1794-OE12 operates on a 24V DC power supply (range: 10-31.2V DC), draws 80mA from the FLEXbus, and has a maximum power dissipation of 7.68W at 24V DC.

The Allen Bradley 1794-OE12 has a compact form factor measuring 3.7 inches × 3.7 inches × 2.1 inches (H × W × D) and weighs just 0.25 lbs (0.11 kg), saving valuable panel space in control cabinets. It uses an open-style enclosure that requires installation in a protective housing for industrial environments. The module is designed for harsh industrial conditions, with an operating temperature range of -20°C to 60°C (-4°F to 140°F) and storage temperature tolerance of -40°C to 85°C (-40°F to 185°F). It withstands operating shock of 30g and vibration of 5g at 10 to 500 Hz, ensuring reliability in demanding applications.

Specifications

Model	1794-OE12
Module Type	12-Channel Single-Ended Analog Output Module
Resolution	16-bit
Conversion Speed	2.5 ms per channel
Power Supply Range	10.5–31.2 V DC
FlexBus Current	80 mA
Mounting Method	Open housing design
Dimensions	94.0 × 94.0 × 53.3 mm (3.7 × 3.7 × 2.1 inches)

Application scenarios

The Allen Bradley 1794-OE12 excels in manufacturing facilities, particularly those that produce electronics or automobiles. These locations frequently have a lot of machinery that requires precise signals to move or stop, such as assembly tools, conveyor belts, and robotic arms. The module can simultaneously send out multiple analog signals thanks to its 12 channels. For instance, it can simultaneously control the pressure of a robotic gripper (using ±10 V voltage signals) and the speed of a conveyor belt (using 4-20 mA current signals). These controls are extremely accurate thanks to its 16-bit resolution, which lowers errors and maintains production consistency.

The Allen Bradley 1794-OE12 is also used in water treatment facilities. Here, employees must carefully control the flow of water, mix chemicals, and operate filtration systems. The module is ideal for this because it can manage both current and voltage outputs. It can send signals to pumps that add chemicals to clean the water (using ±10 V signals) and to valves that regulate the amount of water that flows through pipes (using 0–20 mA signals). Water treatment plants frequently face challenging conditions, such as fluctuating temperatures, so the module's resilience (operating between -20°C and 60°C) keeps it functioning properly.

FAQ

Q: How many analog output channels does the 1794-OE12 module provide, and what output types are supported?

A: The Allen-Bradley 1794-OE12 is a high-density Flex I/O analog output module featuring 12 single-ended analog output channels that are non-isolated. Each channel is independently configurable to support voltage outputs of 0–10V DC or ±10V DC and current outputs of 0–20mA or 4–20mA. This channel density-12 channels per module-reduces module count by up to 67% compared to 4-channel alternatives, optimizing control cabinet space utilization.

Q: What is the output resolution and accuracy of the 1794-OE12?

A: The 1794-OE12 delivers 16-bit digital-to-analog conversion (2's complement data format). Resolution is 320 µV/count for voltage outputs and 0.641 µA/count for current outputs. Absolute accuracy is ±0.1% of full scale at 25°C, with a temperature drift of ±0.004% of full scale per °C. For critical applications such as chemical dosing or temperature control loops, this drift specification translates to a maximum accuracy degradation of 0.14% across a 35°C operating temperature range (e.g., from 25°C to 60°C).

Q: What is the output update rate of the 1794-OE12?

A: The step response for the 1794-OE12 achieves 70% of final value in the first conversion cycle, 96% in the second cycle, and 100% in the third cycle. Typical per-channel update time is 1ms. For a full 12-channel scan, the total update latency is approximately 12ms under worst-case sequential processing.

Q: Does the 1794-OE12 provide isolation between channels?

A: No, the 1794-OE12 does not provide isolation between individual output channels. The module provides 50V continuous isolation voltage (basic insulation type) between the field side and system side, tested at 850V DC for 60 seconds. For applications requiring channel-to-channel isolation, consider alternative modules such as the 1794-OE4 or 1794-OF4I series.

Q: Does the 1794-OE12 require external signal conditioning or periodic calibration?

A: No external signal conditioning is required. The module includes a built-in 16-bit DAC converter that performs direct digital-to-analog conversion without external components. The module is factory calibrated and does not require user calibration or periodic recalibration-factory calibration maintains ±0.1% accuracy indefinitely under normal operating conditions.

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