Allen-Bradley 1794-IV16 Flex I/O Input Module

Product Overview

The 1794-IV16 comes from Allen-Bradley as a reliable input module. First, this device belongs to the popular Flex I/O series. Specifically, it provides 16 nonisolated sourcing inputs for industrial applications. Therefore, the 1794-IV16 works well for precise control and monitoring tasks. You can use this module with a central controller via the Flex I/O backplane. Consequently, it expands your system's digital input capacity significantly. For example, you can connect up to 16 field sensors to a single module.

Technical Specifications (Voltage Ratings)

The 1794-IV16 operates across a precise voltage range. Specifically, the minimum on-state voltage sits at 10V DC. Meanwhile, the nominal on-state voltage is 24V DC for normal operation. Moreover, the maximum on-state voltage reaches 31.2V DC. This range gives you flexibility for different power conditions. In comparison, many competitor modules offer narrower ranges. As a result, the 1794-IV16 handles voltage fluctuations better.

Technical Specifications (Current Ratings)

Current handling on the 1794-IV16 is equally impressive. First, the minimum on-state current measures 2.0 mA. For typical operation at 24V DC, you get 8.0 mA. Finally, the maximum on-state current goes up to 11.0 mA. In addition, the off-state behavior stays well controlled. Specifically, the maximum off-state voltage is 5V DC. Meanwhile, the minimum off-state current sits at 1.5 mA. Thus, false triggering rarely occurs with this module.

Technical Specifications (Impedance and Dissipation)

The 1794-IV16 also features a maximum input impedance of 4.7 kΩ. This value optimizes signal processing for your field devices. Consequently, you get stable and accurate input readings. Moreover, the module dissipates up to 5.7 W at 31.2V DC. Thus, it maintains safety and efficiency during operation. For instance, you do not need extra cooling for this module.

Summary of Key Technical Parameters

• Number of Inputs: 16 nonisolated sourcing

• Minimum On-State Voltage: 10V DC

• Nominal On-State Voltage: 24V DC

• Maximum On-State Voltage: 31.2V DC

• Minimum On-State Current: 2.0 mA

• Nominal On-State Current: 8.0 mA at 24V DC

• Maximum On-State Current: 11.0 mA

• Maximum Off-State Voltage: 5V DC

• Minimum Off-State Current: 1.5 mA

• Maximum Input Impedance: 4.7 kΩ

• Maximum Power Dissipation: 5.7 W at 31.2V DC

• Input Type: Sourcing (positive logic)

• Isolation: Nonisolated between inputs and backplane

Environmental and Mechanical Data

The 1794-IV16 shares the same rugged design as other Flex I/O modules. First, it operates in temperatures from 0 to 55 °C (32 to 131 °F). Meanwhile, storage temperatures range from -40 to 85 °C (-40 to 185 °F). The module withstands vibration of 5 g at 10-500 Hz. Additionally, it handles operating shock of 30 g peak acceleration. Therefore, the 1794-IV16 suits harsh factory environments. The module measures approximately 87 x 94 x 92 mm. For reference, it weighs only about 227 g (8.01 oz). As a result, installation requires very little panel space.

Installation Guidelines

Mount the 1794-IV16 on a standard DIN rail. First, attach the module to a compatible terminal base unit. For example, suitable bases include the 1794-TB3 or 1794-TB3G. Then, connect your field devices to the screw terminals. Use stranded copper wire rated at 75 °C or higher. Recommended wire size ranges from 0.34 to 2.5 mm² (22 to 12 AWG). Tighten terminal screws to 0.8 Nm (7 lb-in). Accordingly, always disconnect power before wiring the 1794-IV16. Finally, ground the DIN rail properly to avoid noise issues.

Important installation notes include the following:

• Use a PELV or SELV power supply for safety.

• Do not exceed 31.2V DC on any input channel.

• Keep input wiring separate from high-power cables.

• Verify the source type matches your field sensors.

Packaging List

• 1794-IV16 input module (1 unit)

• Removable terminal block (attached to mating base)

• Product identification label

• Installation instructions sheet

Frequently Asked Questions (FAQ)

1. What type of sensors work with the 1794-IV16?
The 1794-IV16 accepts sourcing (PNP) type sensors. Specifically, these sensors supply positive voltage to the input channel.

2. Can I mix the 1794-IV16 with other Flex I/O modules?
Yes, you can mix this module freely. The 1794-IV16 works alongside analog, output, and specialty modules. For instance, up to eight modules connect to one 1794-AENT adapter.

3. What happens if I apply 30V DC to an input?
The 1794-IV16 tolerates up to 31.2V DC maximum. However, staying at 24V DC nominal ensures longer module life.

4. Does this module support isolated inputs?
No, the 1794-IV16 provides nonisolated inputs. Specifically, all inputs share a common return path. Therefore, use an external isolator for noisy environments.

5. How do I know the input is active?
Each channel on the 1794-IV16 has a green LED indicator. The LED turns on when the input voltage exceeds 10V DC. Thus, you get clear visual feedback for every channel.