Allen-Bradley 1794-OE4 4-Channel Analog Output

Product Introduction 1794-OE4

The Allen-Bradley 1794-OE4 offers a cost-effective and flexible solution for analog output control within the Flex I/O system. This module features four single-ended, non-isolated output channels that are user-configurable. It supports a variety of signal types, including 0-20 mA, 4-20 mA current loops, and ±10V DC or 0-10V DC voltage signals. Consequently, the 1794-OE4 is an excellent choice for controlling modulating final control elements. These include variable frequency drives, modulating valves, and actuators in industrial processes.

Technical Specifications 1794-OE4

The 1794-OE4 utilizes pulse width modulation for its output conversion, achieving a fast conversion rate of 1.024ms for all channels. Its data format is left-justified, 16-bit 2's complement, providing a resolution of 12 bits plus a sign bit. Specifically, this translates to a resolution of 2.56mV per count for voltage outputs and 5.13µA per count for current outputs. Such precision ensures smooth and accurate control over connected field devices.

Furthermore, the module's accuracy is outstanding. At 25 °C, the current output accuracy is 0.425% of full scale, while the voltage output accuracy is 0.133% of full scale. The accuracy drift with temperature is minimal: 0.0069% full scale/°C for current and 0.0045% full scale/°C for voltage. The 1794-OE4 also provides a 3mA maximum current load on the voltage output and supports a 15 to 750Ω resistive load for the current output.

Mechanical and Environmental Parameters 1794-OE4

The Allen-Bradley 1794-OE4 is built for industrial environments. Its compact dimensions are 94.0 x 94.0 x 53.3 mm (3.7 x 3.7 x 2.1 inches). The module operates within a temperature range of 0 to 55 °C and can be stored safely between -40 and 85 °C. Additionally, it tolerates 5-95% non-condensing relative humidity, 30g of operating shock, and 5g of vibration at 10-500 Hz. This robust construction ensures reliable operation even in challenging factory floor conditions.

Installation and Wiring Guide

Installing the 1794-OE4 is straightforward. It requires a compatible Flex I/O terminal base; compatible bases include the 1794-TB2, -TB3, -TB3S, -TB3T, -TB3TS, and -TBN. First, set the keyswitch on the selected base to Position 4. Next, mount the base unit securely onto a DIN rail. Then, align the 1794-OE4 module with the base's guide slots and press it firmly until it snaps into place. Finally, connect the external power supply (10-31.2V DC nominal) and field wiring to the appropriate terminals on the base. The module requires no calibration, simplifying the commissioning process.

Packaging and Shipping

Your Allen-Bradley 1794-OE4 module will be carefully packaged to prevent damage during transit. The shipment includes the analog output module only. The terminal base and any necessary mounting hardware are sold separately. We exclusively utilize Fedex, UPS, and DHL for our global shipping operations to ensure your order arrives quickly and safely.

Frequently Asked Questions (FAQ)

1. What signal types does the 1794-OE4 support?
The Allen-Bradley 1794-OE4 supports 0-20 mA, 4-20 mA, ±10V DC, and 0-10V DC output signals.

2. Which terminal bases are compatible with the 1794-OE4?
It is compatible with the 1794-TB2, -TB3, -TB3S, -TB3T, -TB3TS, and -TBN bases.

3. What is the required keyswitch position for this module?
The keyswitch on the terminal base must be set to Position 4 for the 1794-OE4 to function correctly.

4. What is the resolution of the analog outputs?
The module offers 12-bit resolution plus sign, providing 2.56mV/cnt for voltage and 5.13µA/cnt for current.

5. Does the 1794-OE4 require field calibration?
No, the 1794-OE4 does not require any manual calibration, which simplifies maintenance.