1794-IH16 | 16-Channel 125V DC Input Module Allen-Bradley

Allen-Bradley 1794-IH16 Flex I/O Digital Input Module

Product Introduction

The Allen-Bradley 1794-IH16 is a high-density digital input module from the Flex I/O family. Specifically, it features 16 non-isolated input points. This module operates at a nominal voltage of 125V DC. Therefore, it is ideal for applications requiring high-voltage DC input monitoring. The 1794-IH16 is approved for use in hazardous locations. Consequently, it provides a reliable solution for demanding industrial environments. This module interfaces directly with 125V DC field devices such as relays, switches, and sensors.

Technical Specifications

The 1794-IH16 provides 16 digital input channels. All channels are non-isolated and share a common return path. These inputs accept DC voltage signals within a specific range. For instance, the minimum on-state input voltage is 90V DC sinking voltage. The nominal on-state voltage is 125V DC. Meanwhile, the maximum on-state voltage is 146V DC. The module reliably detects high-voltage DC signals from field devices.

The module also has specific off-state characteristics. Specifically, the maximum off-state voltage is 20V DC. This ensures the module distinguishes between a valid ON signal and a false trigger. Furthermore, the input current ratings are precisely defined. The minimum on-state current is 1 mA. The nominal on-state current is 2 mA at 125V DC. The maximum on-state current is 3 mA. Additionally, the maximum off-state current is 0.8 mA. These ratings ensure compatibility with a wide range of DC input devices.

At the maximum rated voltage of 146V DC, the 1794-IH16 dissipates 6 Watts of power. Meanwhile, its thermal dissipation is 20.47 BTU/hr. This efficient design minimizes heat generation in the control cabinet. The module requires no external power supply beyond the input signal.

Hazardous Location Approval

A key feature of the 1794-IH16 is its North American Hazardous Location Approval. Specifically, this certification indicates the module is suitable for safe operation in dangerous industrial environments. Therefore, it can be installed in areas with potentially explosive atmospheres. This makes the 1794-IH16 a reliable choice for oil and gas, chemical, and mining applications. Always follow local regulations and installation guidelines for hazardous locations.

Compatible Terminal Bases

The 1794-IH16 requires a compatible terminal base for installation. Specifically, it works with a variety of Flex I/O 1794 series terminal bases. These include:

• 1794-TB3 terminal base

• 1794-TB3S terminal base

• 1794-TB3K terminal base

• 1794-TB3SK terminal base

Select the appropriate base based on your wiring needs. The terminal base determines the wire size and connection method. The "K" versions feature a keyed design for secure mating. Always use wiring practices suitable for high-voltage DC signals.

Mechanical and Environmental Parameters

The 1794-IH16 is built for reliable operation in industrial settings. Its installed dimensions are 3.7 x 3.7 x 2.7 inches. When not installed, the dimensions are 1.8 x 3.7 x 2.1 inches. This compact form factor saves valuable panel space. The module has an open-style enclosure. It operates within a standard industrial temperature range.

Installation Guide

Installing the 1794-IH16 is a straightforward process. First, mount the compatible terminal base (such as 1794-TB3 or 1794-TB3S) onto a DIN rail. Next, snap the 1794-IH16 module firmly onto the terminal base. Ensure it clicks securely into place.

Connect your DC input devices to the terminal base according to the wiring diagram. Pay attention to the sinking input configuration. Connect the common return path correctly. Finally, connect the communication adapter to complete the Flex I/O assembly.

Always power down the system before installation. Moreover, verify all connections are secure before applying power. After power-up, check the status indicators to confirm normal operation. For hazardous location installations, follow all relevant safety procedures.

Status Indicators

The 1794-IH16 provides clear visual status feedback. Specifically, it features individual channel status indicators. These LEDs show the on/off state of each input channel. Therefore, they simplify troubleshooting and reduce maintenance downtime.

Packaging List

Your shipment for the Allen-Bradley 1794-IH16 includes:

• (1) Allen-Bradley 1794-IH16 Flex I/O Digital Input Module

• (1) Installation Instructions manual

The module is packaged in an anti-static bag for safe transport.

Shipping Information

All orders are shipped via premium courier services. Your 1794-IH16 will be dispatched using FedEx, UPS, or DHL. Moreover, you will receive tracking information once your order ships.

Frequently Asked Questions (FAQ)

1. What voltage does the 1794-IH16 operate at?
The 1794-IH16 operates at a nominal voltage of 125V DC. It accepts input voltages from 90V DC (minimum on-state) up to 146V DC (maximum on-state). This makes it suitable for high-voltage DC applications.

2. Are the inputs on the 1794-IH16 isolated?
No, the inputs on the 1794-IH16 are not isolated. All 16 inputs share a common return path. Therefore, proper wiring practices are essential to avoid ground loops.

3. Which terminal bases are compatible with the 1794-IH16?
The 1794-IH16 is compatible with several terminal bases. Specifically, it works with 1794-TB3, 1794-TB3S, 1794-TB3K, and 1794-TB3SK. The "K" versions feature a keyed design for secure mating.

4. Can the 1794-IH16 be used in hazardous locations?
Yes, absolutely. The 1794-IH16 has a North American Hazardous Location Approval rating. Therefore, it is suitable for safe operation in dangerous industrial environments.

5. What is the current consumption of the 1794-IH16 inputs?
The input current ratings are precisely defined. The nominal on-state current is 2 mA at 125V DC. The minimum on-state current is 1 mA, and the maximum is 3 mA. Additionally, the maximum off-state current is 0.8 mA.