1794-OE4 Flex I/O Analog Output Module

Product Overview

The 1794-OE4 is an analog output module from the Allen-Bradley Flex I/O family. It provides four single-ended output channels. You can configure each channel for 0 to 20 mA, 4 to 20 mA, +/-10 Volts DC, or 0 to 10 Volts DC. The module uses pulse width modulation as its conversion type. It has a conversion rate of 1.024 ms for all channels. The data format is left justified, 16-bit two's complement. Resolution is 12 bits plus sign. This gives a voltage increment of 2.56 mV per count and a current increment of 5.13 µA per count.

Application Scenarios

Use the 1794-OE4 in distributed I/O nodes. It works with Flex I/O communication adapters such as Ethernet, ControlNet, Profibus, and Remote I/O. The module controls modulating devices. Examples include variable frequency drives, control valves, converters, dampers, and louvers. It also interfaces with final control elements in industrial processes. The module suits both automatic and manual control loops.

Technical Specifications

The module has a current input accuracy of 0.425% full scale at 25 degrees Celsius. It drifts by 0.0069% full scale per degree Celsius. Voltage input accuracy is 0.133% full scale at 25 degrees Celsius. Voltage drift is 0.0045% full scale per degree Celsius. The output signal ranges are 4 to 20 mA, 0 to 20 mA, +/-10 Volts, and 0 to 10 Volts. The external DC supply current is 70 mA at 24 Volts DC. Isolation voltage is 50 Volts between I/O and system. The module has a 24 milliseconds input step response time for voltage or input terminals. Bus rating is 20 mA. Voltage output step response time to 63% of full scale is 24 ms. Maximum current load on voltage output is 3 mA. Resistive load for output current is 15 to 750 Ohms. Maximum power dissipation is 4.5W at 31.2 Volts DC. Maximum thermal dissipation is 15.3 BTU/hour at 31.2 Volts DC. Operating temperature range is 0 to 55 degrees Celsius.

Installation and Maintenance Guide

The 1794-OE4 mounts on a DIN rail. It requires one compatible terminal base. Supported bases include 1794-TB2, -TB3, -TB3S, -TB3T, -TB3TS, and -TBN. The module has a keyswitch position of 4. No individual channels are isolated. The module does not need calibration. An external DC supply of 10.0 to 31.2 Volts DC is required. The module has a green/red power and status indicator. Use proper wire size as determined by the terminal base. Ensure operating temperature stays between 0 and 55 degrees Celsius.

Packing List

The package includes one 1794-OE4 analog output module and installation documentation. Shipping options are Fedex, UPS, or DHL.