Allen-Bradley 1756-IA16I ControlLogix AC Isolated Input Module

1756-IA16I Product Introduction

The Allen-Bradley 1756-IA16I is a high-density discrete input module from Rockwell Automation's ControlLogix family. It offers sixteen individually isolated input channels, operating at a nominal voltage of 120V AC. This design provides exceptional protection against ground loops and electrical noise. Consequently, the 1756-IA16I is the preferred choice for applications requiring reliable signal acquisition from diverse field devices.

Moreover, this module provides flexibility through programmable input filtering. Users can select filter times of 9 or 18 milliseconds to debounce switch contacts and reject high-frequency noise. Additionally, the 1756-IA16I features a 36-pin removable terminal block for easy wiring and maintenance. Its front-panel LEDs offer clear visual status for each channel, simplifying troubleshooting.

1756-IA16I Technical Specifications

The Allen-Bradley 1756-IA16I operates with a nominal input voltage of 120V AC. Its actual operating voltage range extends from 79V to 132V AC, at a frequency of 47 to 63 Hz. For a valid ON-state signal, the module requires a minimum current of 5 mA at 79V AC. Similarly, the maximum ON-state current is 15 mA at 132V AC. In the OFF state, the maximum leakage current is only 2.5 mA, ensuring clear distinction between logic states.

Furthermore, the 1756-IA16I offers user-selectable input delay times. This feature allows you to program the module for either a 9 ms or an 18 ms filter delay. Additionally, a hardware delay of up to 10 ms is present, leading to a total response time that suits your application's needs. This programmable filtering effectively eliminates false triggers from contact bounce and electrical noise.

1756-IA16I Power and Backplane Requirements

For system integration, the 1756-IA16I draws modest power from the ControlLogix backplane. Specifically, it requires 125 mA from the 5.1V DC supply and just 2 mA from the 24V DC supply. Consequently, the total backplane power consumption is a low 0.71 Watts. The module's maximum power dissipation is rated at 4.9 Watts at 60°C, with a corresponding thermal dissipation of 16.71 BTU/hr. These low power requirements make it an efficient addition to any chassis.

Mechanical and Environmental Specifications

The Allen-Bradley 1756-IA16I is built for reliability in industrial settings. Its operational temperature range is from 0°C to 60°C. Additionally, it can function in relative humidity levels between 5% and 95%, non-condensing. For storage and transport, the module tolerates temperatures from -40°C to 85°C.

Importantly, the 1756-IA16I provides individual isolation for each of its sixteen channels. This means each input has its own dedicated common, allowing you to connect signals from different AC sources without interference. The isolation voltage is rated at 125V continuous (basic insulation), tested at 1200V AC for 2 seconds between inputs and the backplane.

Installation and Compatibility

Installing the 1756-IA16I is simple and flexible. You can mount it in any slot of a local or remote ControlLogix chassis. It is fully compatible with all ControlLogix processors and communication adapters. Therefore, you can easily use this module in distributed I/O applications across a plant floor.

For wiring, the 1756-IA16I uses a 36-pin Removable Terminal Block. It is compatible with the 1756-TBCH (NEMA) and the 1756-TBS6H (Spring clamp) RTB housings. This modular design enables quick module replacement without the need to disconnect and reconnect individual field wires, significantly reducing maintenance downtime.

Packaging List

Your order for the Allen-Bradley 1756-IA16I will include the following:

• 1 x 1756-IA16I ControlLogix Isolated Input Module

• 1 x Installation Instructions Guide

Please note: The Removable Terminal Block (RTB) is not included and must be ordered separately. Choose either the 1756-TBCH or 1756-TBS6H to suit your wiring preference.

We ship all orders promptly and securely via our trusted logistics partners: FedEx, UPS, or DHL.

Frequently Asked Questions (FAQ)

1. What is the main advantage of the 1756-IA16I's individual isolation?
Individual isolation on the 1756-IA16I allows each input channel to have its own separate common. This feature prevents ground loops and lets you wire signals from different AC sources to the same module safely.

2. How can I set the input filter time on the 1756-IA16I?
The input filter time on the 1756-IA16I is programmable via your ControlLogix configuration software. You can conveniently select either a 9 ms or an 18 ms delay to suit your specific noise environment.

3. Which terminal block should I use with the 1756-IA16I?
The 1756-IA16I is designed to work with 36-pin RTB housings. The specific compatible models are the 1756-TBCH (screw type) and the 1756-TBS6H (spring clamp type).

4. Can the 1756-IA16I be used in a remote I/O chassis?
Yes, absolutely. The 1756-IA16I works perfectly in both local and remote ControlLogix chassis. You can install it in any chassis that communicates via a ControlLogix communication adapter.

5. What do the LEDs on the 1756-IA16I indicate?
Each of the sixteen channels on the 1756-IA16I has a dedicated LED. When an input signal is active, the corresponding LED illuminates. This provides immediate visual confirmation of the module's status.