Allen-Bradley 1794-IE4XOE2 Flex IO Combination Analog I/O Module

Manufacturer

Allen Bradley

Product Type

Flex I/O High-Density Analog Module

Product Line

Flex I/O 1794

Part Number

1794-IE4XOE2

UPC

612598137800

Weight

0.31 lbs (0.14 kg)

Resolution

12 bit plus sign

Conversion Type

Pulse Width Modulation (PWM)

Product Description

Flex IO combination analog I/O module

No. of inputs

Four (4) single-ended, non-isolated inputs

Current input signals

0-20 mA / 4-20 mA

Input resolution

12 bits unipolar / 11 bits plus sign bipolar

No. of outputs

Two (2) Single Ended, non-isolated

Output type

0 to 20 mA; 4 to 20 mA; +/- 10VDC;

Terminal base

1794-TB2, -TB3, -TB3S, -TB3T, -TB3TS

Mounting

DIN Rail

Wire Size

Determined by installed terminal base

The Allen-Bradley 1794-IE4XOE2 is a combination I/O module. This module is part of the Flex I/O product family that are popularly used to implement distributed I/O architecture. The 1794-IE4XOE2 features the combined capability of analog and input channels as this module comes with Four (4) single-ended, non-isolated analog input channels and Two (2) single-ended, non-isolated analog output channels.

The analog input channels are configurable to receive analog input signals such as 0-20 mA and 4-20 mA signals and 0-10VDC and +/- 10VDC voltage signals. It has a built-in Analog to Digital converter (ADC) using the successive approximation method. Each channel has a conversion rate of 256μs with step response to 63% of 9.4 ms for voltage and 18.2 ms for current. It has an absolute accuracy of 0.20% Full Scale @ 25°C. This module saves the converted data into left justified, 16 bit 2s complement data format.

The analog output channels are capable of providing 0-20 mA and 4-20 mA signals as well as 0-10VDC and +/- 10VDC. The analog circuitry of the 1794-IE4XOE2 combination analog I/O module features a built-in Digital to Analog converter (DAC) using Pulse width modulation conversion method. The converted data is provided with an accuracy of 0.133% Full Scale @ 25°C and 0.425% Full Scale @ 25°C.

The 1794-IE4XOE2 requires use of a terminal base unit. This terminal base provide the terminal connection points as well as the backplane interface pins. Appropriate terminal base unit for use with the 1794-IE4XOE2 are 1794-TB2, -TB3, -TB3S, -TB3T, -TB3TS Terminal Base Units.

The 1794-IE4XOE2 module contains 4 single-ended and non-isolated inputs. The resolution for unipolar inputs is 12 bits while the resolution for bipolar inputs is 11 bits. The data format is left-justified 16-bits 2’s complement. The conversion type supported by the 1794-IE4XOE2 module is successive approximation conversion. The input current terminal is selectable between 4 to 20 milliamps or 0 to 20 milliamps. The input voltage terminal is selectable between ±10 Volts and 0 to 10 Volts. The normal mode rejection ratio for the voltage terminal is -3 dB at 17 Hertz and -10 dB at 50 Hertz. The normal mode rejection ratio for the current terminal is -3 dB at 9 Hertz and -15.3 dB at 50 Hertz. The input impedance for the voltage terminal is 100 kiloohms and for the current terminal, it is 238 Ohms. The 1794-IE4XOE2 module contains 2 single-ended and non-isolated outputs. The conversion type is pulse width modulation. The current load on the voltage output is 3 milliamps (maximum). The dimensions of the 1794-IE4XOE2 module are 1.8 x 3.7 x 2.1 inches. The power required is 24 Volts DC (19.2 to 31.2 Volts DC) with 70 milliamps of current at 24 Volts DC. The maximum thermal dissipation is 13.6 BTU/hour and the maximum power dissipation is 4 Watts at 31.2 Volts DC.

1. How does the AB 1794-IE4XOE2 streamline high-precision signal acquisition and control output functions within a FLEX I/O distributed automation architecture?

The AB 1794-IE4XOE2 combines four analog input channels and two analog output channels in a single module, enabling accurate process measurement and responsive control for a wide range of industrial applications.

2. Why is the AB 1794-IE4XOE2 particularly advantageous for process-control environments requiring both analog monitoring and actuation capabilities?

The AB 1794-IE4XOE2 consolidates input and output functionality into one compact platform, reducing panel space requirements, simplifying wiring, and enhancing system efficiency.

3. What configuration variables should engineers meticulously evaluate when commissioning the AB 1794-IE4XOE2 in a mission-critical control system?

Engineers should verify signal type selection, scaling parameters, input filtering settings, output range configuration, network compatibility, and controller integration requirements to ensure optimal performance of the AB 1794-IE4XOE2.

4. How can the AB 1794-IE4XOE2 contribute to superior process stability and operational visibility in complex industrial environments?

By delivering accurate analog input measurements and precise output control signals, the AB 1794-IE4XOE2 enables real-time process adjustments, improving control accuracy and enhancing overall plant performance.

5. Which diagnostic capabilities of the AB 1794-IE4XOE2 help maintenance teams identify instrumentation anomalies and reduce unscheduled downtime?

The AB 1794-IE4XOE2 provides channel-level diagnostics and status monitoring that assist technicians in detecting signal irregularities, wiring faults, and device-related issues before they impact production operations.

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