Allen-Bradley 1771-IGD TTL Input Module, 16 Inputs

Product Overview

The Allen-Bradley 1771-IGD is a digital TTL input module. It provides 16 input points. You can select positive or negative logic levels. This module works with Series A or B 1771 chassis. It also fits the 1771-AM1 and 1771-AM2 I/O chassis. The module uses a 5V DC supply. It detects signals from 2.0 to 5.25 VDC for logic high (positive logic). The off state ranges from -0.2 to 0.8 VDC. This module offers less than 1 ms signal delay. It is designed for reliable industrial control.

Application Scenarios

This module fits into PLC systems from Allen-Bradley. It reads TTL-level signals from sensors or encoders. Use it in manufacturing lines, packaging machines, or process control. The selectable logic helps match different signal standards. It works in automated assembly, material handling, and test equipment. The rugged design suits harsh factory floors.

Technical Specifications

Electrical Characteristics

The 1771-IGD operates at 5.0-5.3 VDC. Backplane current is 130 mA at 5VDC. Power dissipation ranges from 0.4 W to 2.7 W. Isolation voltage is 1500V AC RMS for 1 second. The module includes a 0.5A 250V fuse for protection.

Input Specifications

It has 16 inputs. Input voltage: positive logic ON = 2.0-5.25 VDC, OFF = -0.2 to 0.8 VDC. Negative logic reverses these ranges. Signal delay is less than 1 ms. Typical off delay is 20 ms. Current sink per input: 7 mA max source, 0.8 mA max sink.

Environmental and Mechanical

Operating temperature is 0-60°C. The module mounts on a 1771 rack. Use a 1771-WH wiring arm for connections. Wire size is 14 AWG stranded copper with 60°C insulation. Torque terminals to 9 lb-in (1.0 Nm). Recommended cable is Belden 8761.

Installation & Maintenance Guide

Mount the module into any compatible 1771 chassis. Ensure power is off before inserting. Use the 1771-WH wiring arm. Strip wires to proper length. Tighten screws to the specified torque. Do not exceed 5.3 VDC on supply. Regularly check the fuse for integrity. Keep the module clean and free of debris.

Packing List

1 x Allen-Bradley 1771-IGD TTL Input Module
1 x Product documentation