Allen-Bradley 1794-IB16 Flex I/O DC Input Module

1794-IB16 16-Channel DC Sinking Input Module

Product Introduction

The Allen-Bradley 1794-IB16 is a high-density DC digital input module from the Flex I/O 1794 series. It offers sixteen non-isolated sinking input channels that accept signals from 10VDC to 31.2VDC. This wide range makes it compatible with many sensors, push buttons, and other DC field devices. Furthermore, the 1794-IB16 supports distributed I/O architectures. Consequently, you can place modules close to signal sources, which significantly reduces cable lengths and overall installation costs. Moreover, its selectable input filtering provides flexibility to adapt to various noise environments and switch types.

Technical Specifications

The 1794-IB16 operates with a nominal input voltage of 24VDC. Specifically, it accepts on-state signals from 10VDC minimum to 31.2VDC maximum. The off-state voltage threshold is 5.0VDC maximum, ensuring clear signal discrimination. Additionally, the module features a 1.5mA minimum off-state current. Each sinking input channel draws a nominal on-state current of 8.0mA at 24VDC. The minimum current is 2.0mA, while the maximum reaches 12.0mA. The input impedance measures 4.6KΩ maximum, providing consistent loading for connected field devices.

The module draws a Flexbus current of 30mA from the 5VDC backplane. It dissipates a maximum of 6.1W when operating at 31.2VDC, with corresponding thermal dissipation of 20.8 BTU/hr. Furthermore, the 1794-IB16 provides 850VDC tested isolation between the user and the system. However, individual channels are not isolated from each other. This non-isolated design suits most standard industrial applications while maintaining cost-effectiveness.

Selectable Input Filter Times

A standout feature of the 1794-IB16 is its eight selectable input filter times. You can configure these through the output image table. Both OFF-to-ON and ON-to-OFF transitions offer the same filter options. These include 256μs, 512μs, 1ms, 2ms, 4ms, 8ms, 16ms, and 32ms. By default, the module uses 256μs filtering, which suits most clean signal applications. For noisy environments or applications with mechanical contacts, you can select longer filter times. This action debounces signals and rejects transient noise. For instance, bits 02:00, 01:00, and 00:00 set Filter Time 0 (256μs default). Meanwhile, bits 02:1, 01:1, and 00:1 configure Filter Time 7 (32ms maximum). Therefore, this granular control allows you to optimize the 1794-IB16 for virtually any field input condition.

Mechanical and Environmental Parameters

This module operates reliably across a temperature range of 0°C to 55°C (32°F to 131°F). It also tolerates storage from -40°C to 85°C (-40°F to 185°F). Moreover, it supports non-condensing relative humidity from 5% to 95%. The module withstands operating shocks of 30g and non-operating shocks of 50g. Vibration testing at 5g from 10 to 500Hz per IEC 68-2-6 ensures stability in high-vibration applications. The compact dimensions measure 46mm x 94mm x 53mm (1.8in x 3.7in x 2.1in). Therefore, it is ideal for space-constrained panels. Additionally, the module holds Class I Division 2, Groups A, B, C, D, and Class I Zone 2 Group IIC certifications. It also carries UL, CSA, and CE marks for global compliance.

Installation and Compatibility

Proper installation of the 1794-IB16 requires a compatible Flex I/O terminal base. Supported bases include the 1794-TB3, 1794-TB3S, 1794-TB3K, 1794-TB3SK, 1794-TBKD, and 1794-TB37DS. These terminal bases allow straightforward wiring using 12 AWG (4mm²) stranded copper wire. They also support daisy-chaining of power connections between adjacent modules. Furthermore, the 1794-IB16 integrates with all Flex I/O communication adapters. These include EtherNet/IP (1794-AENT), ControlNet (1794-ACN), DeviceNet (1794-ADN), Profibus DP (1794-APB), and Remote I/O (1794-ASB). The module supports both DIN rail and direct panel mounting. Its keyswitch setting is position 2 for correct electrical alignment. For specialized applications, diagnostic (D) and extreme environment (XT) versions are available. These enhance troubleshooting and reduce maintenance costs in harsh conditions.

Packaging List

• 1 x Allen-Bradley 1794-IB16 DC Input Module

• 1 x Installation Instructions Manual (Publication 1794-5.4)

Note: Terminal bases, communication adapters, and wiring accessories are sold separately.

Shipping Information

We ship all orders using trusted express couriers, including FedEx, UPS, and DHL. Each module receives careful packaging to ensure safe delivery to your facility.

Frequently Asked Questions (FAQ)

1. What is the default input filter time for the 1794-IB16?
The default filter time is 256μs for both OFF-to-ON and ON-to-OFF transitions. You can adjust this setting through the output image table to suit your application.

2. What terminal bases are compatible with the 1794-IB16?
The 1794-IB16 works with the 1794-TB3, 1794-TB3S, 1794-TB3K, 1794-TB3SK, 1794-TBKD, and 1794-TB37DS terminal bases.

3. Are the inputs on the 1794-IB16 isolated from each other?
No, the sixteen input channels on the 1794-IB16 are non-isolated from each other. Isolation is present only between the user and the system at 850VDC.

4. What communication adapters work with this module?
The 1794-IB16 supports EtherNet/IP, ControlNet, DeviceNet, Profibus DP, and Remote I/O communication adapters within the Flex I/O system.

5. Can I mount the 1794-IB16 on a panel rather than DIN rail?
Yes, the 1794-IB16 supports both DIN rail mounting and direct panel mounting, giving you flexibility for various installation requirements.