Allen-Bradley 1771-IAN PLC-5 Input Module 32 Channel

Product Introduction

The Allen-Bradley 1771-IAN module delivers exceptional input density for your PLC-5 control system. This module features thirty-two discrete input channels, organized as four isolated sets of eight inputs each. It accepts 120V AC signals from field devices like pushbuttons, limit switches, and motor starters. The module then converts these signals into logic-level inputs that the processor can read and act upon.

Additionally, this module includes the 1771-WN field wiring arm. This removable terminal block supports the high channel count with ample termination points. You can pre-wire all field connections before installing the module. You can also detach the arm quickly during replacement without touching the existing wiring. Therefore, you significantly reduce downtime and simplify maintenance tasks considerably.

Technical Specifications of the 1771-IAN

The Allen-Bradley 1771-IAN offers thirty-two input channels with a voltage category of 120V AC. The AC operating voltage spans 85 to 138 Volts, accommodating typical industrial power variations. The module organizes its inputs into four independent groups of eight channels each, which provides flexibility for different field wiring configurations.

Moreover, this module has clearly defined signal delay characteristics. For AC inputs, the typical ON delay is 10 ms (±7 ms). The typical OFF delay is 20 ms (±15 ms). These timing specifications suit most general-purpose industrial applications effectively. The module draws a backplane current of 280 mA. It has a maximum AC off-state current of 3.0 mA, with a lower 0.8 mA for DC applications.

Power Dissipation and Thermal Characteristics

The 1771-IAN module manages its power consumption efficiently despite its high channel count. Its maximum power dissipation reaches 7.0 Watts. Correspondingly, the thermal dissipation measures 24.1 BTU/hr at maximum load. These specifications help you calculate the overall heat load within your control cabinet accurately and ensure proper cooling.

Mechanical and Installation Parameters

Physically, the 1771-IAN measures 3.5 x 6.5 x 2.0 inches (89 x 165 x 51 mm). It occupies a single slot in any 1771 series I/O chassis. However, you must verify that the power supply can handle the 280 mA backplane current draw. This module is a Series A unit and supports both ½-slot and 1-slot I/O addressing, which provides configuration flexibility.

Furthermore, the front panel provides comprehensive visual diagnostics. It features thirty-two red status indicators, one for each input channel. Each LED illuminates when its corresponding channel receives a valid input signal. This extensive LED array simplifies troubleshooting considerably and allows quick status checks without a programming terminal.

Installation and Keying Guidelines

Installing the 1771-IAN requires proper keying for safety and correct operation. First, insert the module into any available slot within the compatible chassis. Ensure the backplane connectors mate securely. Next, verify that the system power supply can handle the 280 mA backplane load.

Proper keying is essential to prevent incorrect module insertion. For the 1771-IAN, you must install keying bands between pins 20 and 22 on the upper connector. Additionally, you need to place them between pins 16 and 18 on the lower connector. This physical keying mechanism protects both the module and the chassis backplane from potential damage.

Packaging List

Your shipment for the Allen-Bradley 1771-IAN module includes the following items:

• (1) Allen-Bradley 1771-IAN Digital AC Input Module

• (1) Pre-installed 1771-WN Field Wiring Arm

• (1) Product Installation and Configuration Guide

All components come securely packaged to prevent transit damage. We ship all orders using trusted global carriers such as FedEx, UPS, and DHL.

Frequently Asked Questions (FAQ)

1. Does the 1771-IAN support DC input signals?
The 1771-IAN primarily supports AC inputs with a voltage range of 85-138V AC. While it has DC off-state current specifications, its primary design targets AC applications. For dedicated DC inputs, consider the 1771-IA or 1771-IAD models.

2. How does the 4-set-of-8 grouping work?
The thirty-two inputs divide into four isolated groups, each containing eight channels. This grouping provides electrical isolation between groups, which helps reduce noise coupling and simplifies wiring for different power sources.

3. What is the difference between ½-slot and 1-slot addressing?
½-slot addressing allows two modules to occupy one physical slot logically, doubling I/O capacity. 1-slot addressing assigns one module per slot. The 1771-IAN supports both modes, giving you flexibility in system configuration.

4. What keying positions does the 1771-IAN require?
For correct installation, place keying bands between pins 20 and 22 on the upper connector. Also place them between pins 16 and 18 on the lower connector of the chassis backplane.

5. Can I mix 1771-IAN modules with other input types in the same chassis?
Yes, you can mix the 1771-IAN with other 1771 series I/O modules in the same chassis. Ensure the total backplane current draw from all modules does not exceed the power supply capacity.