Flex I/O Output Module Allen-Bradley 1794-OF4I Isolated Analog

Product Overview

The 1794-OF4I is a Flex I/O isolated analog output module from Allen-Bradley. It provides four isolated analog output channels. This module supports current and voltage signals. Current outputs include 4-20 mA and 0-20 mA. Voltage outputs include ±10V, 0-10V, ±5V, and 0-5V. The step response time is less than 25 microseconds at 63% full scale. It has a 15-bit plus sign resolution. The absolute accuracy is 0.1% full scale at 25°C. Temperature drift is low for both terminals. The module is factory calibrated and offers manual calibration. It works with various Flex I/O terminal bases. The external power supply needs 24V DC nominal. The range is 19.2 to 31.2V DC. The FlexBus draws 50 mA at 5V DC. The module is suitable for hazardous locations.

Application Scenarios

This module fits into any Flex I/O system. Use it with a compatible communication adapter. It works in process control and factory automation. It delivers precise analog signals to actuators or valves. The isolated channels protect against ground loops. It is ideal for applications requiring high accuracy. The fast response suits dynamic control loops. The module can operate in harsh industrial environments.

Technical Specifications

Number of outputs: four isolated. Output types: current and voltage. Current load on voltage output: 3 mA max. Absolute accuracy: 0.1% full scale at 25°C. Voltage accuracy drift: 0.0012% full scale/°C. Current accuracy drift: 0.0025% full scale/°C. Maximum overload: 30V continuous or 32 mA continuous, one channel. Terminal bases: 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, 1794-TBN. FlexBus power: 5V DC, 50 mA. External supply: 24V DC nominal, 19.2-31.2V DC. Mounting: DIN rail or sub-panel. Update rate: 2.5 or 5 ms all channels. Resolution: 0.320 mV/cnt (voltage), 0.656 μA/cnt (current). Operating temperature: 0 to 55°C. Storage temperature: -40 to 85°C. Vibration: 5g at 10-500 Hz. Shock: 30g. Isolation voltage: 120V continuous (with standard base), 250V with 1794-TBN. Thermal dissipation: 16 BTU/hr at 31.2V DC. Dimensions: 3.7 x 2.6 x 3.7 inches.

Installation & Maintenance Guide

Mount the module on a DIN rail or panel. Use a compatible terminal base from the list. Connect the external power supply within the voltage range. The module draws 210 mA from the external supply at 24V DC. Factory calibration is standard. You can manually calibrate if needed. Avoid exceeding overload limits. Ensure proper isolation for your base unit. The module fits any Flex I/O communication adapter. It is approved for hazardous locations.

Packing List

1 x 1794-OF4I module. Installation and user documentation. No additional accessories included. Terminal base ordered separately.